The Effect of Digital Marketing Adoption on SMEs Sustainable Growth: Empirical Evidence from Ghana

: Online presence is fast becoming a marketing hub for contemporary businesses. Often known as digital marketing, the phenomenon offers several opportunities to businesses. Small and medium enterprises (SMEs) are using their online presence to launch stern competitive promotions and interact with consumers. Against the backdrop of the stern competition, digital marketing is being utilized to drive sustainable strategies for SMEs. This study leverages the theory of planned behavior to explore the impact of digital marketing adoption on the sustainable growth of SMEs in Ghana. Using a structured questionnaire and SmartPLS version 3.3 for the data analysis, 533 own-ers/managers of SMEs in Ghana were drawn to administer the questionnaire. Our ﬁndings suggest that, while attitudes toward digital marketing did not inﬂuence the intention to use digital marketing, perceived behavior control and subjective norms were found to affect individuals’ intentions to use digital marketing. Additionally, the results proved a direct positive link between subjective norms and actual behavioral use of digital marketing. Finally, the relationship between the actual use of digital marketing and SMEs’ sustainable growth was also proven positive, afﬁrming that digital marketing signiﬁcantly improved the sustainable growth of SMEs in developing countries. This study contributes to the multiplicity of factors that inﬂuence the behavioral tendencies of managers of ﬁrms in their quest to adopt digital platforms to enhance their sustainable growth. The study’s results serve as guidelines for prospective adopters of digital platforms as they develop their sustainability strategies.


Introduction
The increasing pace of the internet has enabled the invention of smartphones and other digital technologies, transforming communication. Due to the recent dynamism of the business environment, the internet has become a major hub for marketing goods and services. In this context, digital technologies are emerging as innovative tools for carrying out business operations and have led to increased competition [1]. Ref. [2] emphasized the importance of digital marketing in firms' communication strategies. Digital marketing is defined as "the use of technology in marketing efforts and business practices by marketing goods, services, information, and ideas via the internet, cell phones, display advertisements, and other electronic media" ( [3], p. 4). It has been stated that digital technology has the potential to improve a firm's performance while also facilitating entrepreneurial activities [4]. Moreover, digital technologies serve as an effective medium for generating ideas that drive firms competitive edge. Surprisingly, few SMEs have integrated and implemented these novel digital marketing approaches into their companies' sustainability marketing strategies [29]. SMEs in Ghana typically face challenges, such as inadequate resources, poor marketing mechanisms, and a limited market, and are incapable of succeeding in the challenging business climate [25]. Scholars have argued that the adoption of digital technologies is key for a successful marketing campaign and is regarded as one of the approaches that SMEs utilize to rapidly respond to business uncertainty in the recent dynamic business environment and for competitiveness [3]. It is evident that digital marketing technologies, such as social media, e-marketing, content marketing, and affiliate marketing, have become sustainable digital advertising tools and could be vital for SMEs as they provide smooth twoway communication, visibility, business advancement, fast communication with customers, and sustainable business growth [33,34].
As such, the adoption of digital marketing provides a solution that helps SMEs overcome their marketing and advertising challenges, allowing them to compete with larger firms and achieve their set objectives [24]. It offers SMEs the opportunity and the ability to take on challenges [30]. Furthermore, SMEs usage of digital marketing will result in better customer service, customer satisfaction, and growth. Despite the relevance of digital marketing tools in recent business transformation, most of the SMEs located in Ghana are hesitant and far behind in adopting digital technologies for business activities compared to large businesses [8,35]. Small businesses in Ghana are expected to adopt and use digital marketing, given that today's consumers are demanding, yet they are skeptical of and underutilizing the capabilities of digital marketing [33,36,37]. Additionally, SMEs' contribution to the Ghanaian economy is huge, and their inability to cope with the globalization process poses a challenge to their development. As a result, the transition to digitalization by SMEs is pivotal to their growth and development, since their success is significant to the country's economy. In view of this, it is crucial to examine and understand SMEs' intentions regarding digital marketing adoption, given their potential advantages, especially for marketing reasons. Moreover, limited empirical studies on the behavioral intention towards the adoption of digital marketing among SMEs are still in the early stages in developing economies, such as Ghana [36,38]. Furthermore, studies devoted to SME's usage of digital marketing are insufficient in the context of Ghana [24,25], which calls for further studies. As a result of this knowledge gap, the current research reflects on the connection between digital marketing adoption and SMEs' sustainable growth from the perspective of developing economies. Specifically, this current study seeks to investigate the effect of the adoption of digital marketing on SMEs sustainable growth through the lens of the theory of planned behavior. Focusing on the digital marketing adoption by SMEs in Ghana to gear towards sustainable growth, the current study is based primarily on the hypothesis that behavioral tendencies inspire SMEs digital marketing adoption and may have a significant effect on sustainable growth. Thus, the study intends to analyze the degree to which attitude, perceived behavior control, and subjective norms influence SMEs behavioral intentions toward digital marketing adoption. Moreover, the study seeks to explore the extent to which actual usage of digital marketing affects SMEs' sustainable growth. By applying the theory of planned behavior (TPB) to digital marketing research, the current study presents a comprehensive assessment of organizational behavior towards technology adoption (digital marketing) in the SME domain, which remained unexplored. Again, the present study contributes to the theory of planned behavior (TPB), which supports the influence of attitude, perceived behavior control, and subjective norms on the adoption of digital marketing. The present study also provided a considerable empirical and theoretical basis to buttress the applicability of TPB to digital marketing in the SME context. This study has the following contributions. First, the outcome of the study could be beneficial to the representatives and owners of SMEs to better understand the value of the adoption of digital marketing and its effect on sustainable growth. Second, the current model construct would be very beneficial for marketers and academics, particularly for investigating the perception and intention towards exploring the adoption of digital marketing successfully from developing countries' perspectives. Third, the study also adds to the existing knowledge on digital marketing by strengthening the basis for understanding digitalization through the lens of the TPB, which has not been investigated in the past. The structure of this paper is as follows. This study starts with a literature review of the theoretical background and hypothesis development. The methodology, including sampling and data collection, results in analysis, and discussion, which continues in the next section. The study concludes with the implications, research limitations, and future research directions.

Theoretical Background: Theory of Planned Behavior (TPB)
The current study recognized the relevance of digital marketing for SMEs' sustainable growth. This current study is grounded on the theory of planned behavior [39]. The theory of planned behavior (TPB) was drawn from the original theory of reason and action [40,41]. TPB assumes that an individual's behavior is determined by certain factors associated with motivation and perceptions [42]. Understanding and predicting individuals' behavioral intentions when engaging in a specific behavior is the goal of TPB [43]. As per the theory, an individual's behavior to accomplish a certain action is based on the intentions of the individual to execute that behavior; and the individual's intention is influenced by attitude, subjective norms, and perceived behavioral control [44]. Thus, attitude, subjective norms, and perceived behavioral control influence individual behavioral intention. Attitude refers to an individual's good or bad emotions linked with a particular feeling; subjective norms, on the other hand, refer to the perceived social factor to engage or not engage in an action. In addition, perceived behavioral control is thus an individual's capacity to perform a particular action.
Several studies have applied TPB to predict individuals' intentions and behavior regarding technology adoption and acceptance in the domain of SME [45][46][47][48][49]. The TPB variables, attitudes, subjective norms, and perceived actions, have been proven to have a significant influence on the adoption of digital marketing among SMEs. For instance, [46] applied the theory of planned behavior (TPB) framework in investigating the digital marketing of energy drinks among young adults. Their study evidenced a mediated effect of attitudes, subjective norms, and perceived behavioral control on digital marketing adoption for energy drink use. A study conducted by [47] applied the TPB model to examine purchasing behavior towards digital marketing. Their study witnessed a significant effect of attitude, subjective norms, and pricing on the use of digital marketing. The study further found no significant relationship between perceived behavioral control and the use of digital marketing. Similarly, [48] employed the TPB model to investigate the intention to shop online among Malaysian baby boomers. It was found that attitudes and subjective norms significantly affected the intention to shop online. Nonetheless, their study found no correlation between perceived behavior control and the intention to shop online. Furthermore, [49] proved the direct influence of attitude, subjective norms, and perceived behavioral control on the adoption of online crowdfunding. Moreover, other research [50,51] has also applied TPB to digital marketing adoption in the context of SMEs. It can be concluded from the above discussion that the TPB model has been employed as a useful theory for investigating digital technologies. In this study, the application of TPB would provide a deep explanation of the attitudes and intentions toward using digital marketing by SME managers and owners in developing countries, particularly Ghana, as limited studies exist in the SME digital marketing literature applying this process [51,52].

Attitude towards Digital Marketing
Ref. ([44], p. 188) defined an attitude as the degree to which a person has a favorable or unfavorable evaluation or appraisal of the behavior in question. Attitude is measured by an individual's belief in the execution of certain behaviors and the costs attached to carrying out that action [49]. Attitude is also the evaluation of a person's desirability or otherwise in accomplishing specific actions. It has been observed that the attitude of an individual has a causal effect on performing a specific behavior [53,54]. Similarly, [55][56][57] argued that attitude has a direct influence on individual intentions. Prior theories and empirical studies have found that attitude is regarded as a determining factor of behavioral intention regarding technology adoption [58][59][60]. According to [61], attitudes are individual behavioral requirements toward intentions. [62]'s study on SMEs' intention to use online marketing tools evidenced that individuals' attitudes have a significant impact on behavioral intention. Following this, it is argued that SMEs' positive feelings toward digital marketing are essential to its adoption and successful usage. Ref. [63] analyzed a sample of 282 start-up owners of start-up companies located in India and demonstrated that attitude significantly influences the intention to use digital marketing. Furthermore, [64] indicated that attitudes, skills, and motivation of owners of firms are essential in digital marketing adoption.
Furthermore, [60] hypothesized that attitude has a positive influence on a firm's adoption of mobile app-based business processes. Therefore, we proposed that attitude positively influences behavioral intention to use digital marketing.

H1:
Attitude towards digital marketing would positively influence the behavioral intention to use digital marketing.

Perceived Behavior Control (PBC)
Perceived behavioral control is one of the crux constructs of TPB [44]. It is defined as the individual's capacity and efficacy to execute a specific act and control it; and is regarded as the elements that may influence the individual's performance of certain actions [49]. Ref. [44] further posits that PBC contributes to behavioral intention prediction. This implies that perceived behavioral control is a significant parameter that impinges on intention [65][66][67]. Specifically, PBC influences individual intentions, perceptions, and norms, and ultimately behavior [44]. Additionally, [68]'s study on the adoption of internet banking witnessed that perceived behavior control has a significant impact on behavioral intention. Several studies have shown that behavioral intentions to use innovation can be predicted by perceived behavioral factors [69][70][71]. Refs [69][70][71]. Using TPB, [57] hypothesized that PBC significantly influences the intention to use internet banking. Ref. [72] also demonstrated that PBC positively influences the intention to use mobile viral marketing. Similarly, [73] examined the components of perceived behavioral control in the TPB model and found that PBC plays a significant and complementary role in behavioral intention to use innovation. However, a study conducted by [63] found an insignificant effect of PBC on behavioral intentions. Moreover, in a proposed model of mobile banking acceptance, [60] proved that PBC is an enabler for behavioral intention to use mobile banking. Ref. [74] examined the causal relationships among the TPB variables and evidenced a PBC significant effect on continuous usage intention. Accordingly, the study proposes the following hypotheses: H2: Perceived behavioral control would positively influence the behavioral intention to use digital marketing.

Subjective Norm
According to TPB, the subjective norm refers to the perceived social pressure to perform or not to perform the behavior ( [44], p. 188). This implies that individuals' execution of the action is motivated by individual referrals and compliance with beliefs [75]. Individuals are encouraged to engage in an activity by their beliefs and social pressure if it is supported by significant others [70]. Thus, social norms aid in predicting individual behavioral intentions [76]. Prior studies have argued that subjective norms have a positive effect on behavioral intentions to use, acceptance of technology, and consumers' buying intentions [77,78]. For example, [79] recently studied entrepreneurial intention and behavior using the TPB model. In their study, it was demonstrated that subjective norms have a substantial effect on the entrepreneurial intent to adopt digital technologies. Ref. [50] also indicated that subjective norms positively affect behavioral intentions to adopt new media technologies. In addition, [80]'s study on perceived risk and subjective norms' effect on cloud technology adoption concluded that subjective norms play a crucial role in explaining behavioral intentions in cloud technology adoption. Much recent research has proven that subjective norms influence behavioral intention measurements [51,81]. Accordingly, the following hypothesis is proposed: H3: Subjective norm would positively affect the behavioral intention to use digital marketing.

Behavioral Intention to Use Digital Marketing
Ref. [82] explained that intention is one of the most widely used predictors of individuals' behavior. It has been argued that stated behavioral intention is an essential component of an individual's inclination to perform a specific behavior [83][84][85]. According to [69], the individual decision to accept or reject lies with consumers' intentions. As per [86], the intention to perform a particular behavior explains the reasons an individual engages in that behavior. Thus, individuals' intentions affect behavioral actions [44,87]. In the context of technological adoption, [87][88][89] recently stated that intention is recognized as the driving force behind adopting technological innovation, which influences actual behavior. Several scholars have examined the significance of behavioral intention in the context of technological adoption [90][91][92][93][94]. Furthermore, [95] argued that behavioral intention has a significant effect on the actual usage of social media for engagement. Based on the above discussion, we, therefore, provide the following hypotheses: H4: Behavioral intention would positively influence the actual use of digital marketing by SMEs.

Actual Use of Digital Marketing
According to [95], individual behavioral intentions and attitudes toward a particular system affect its actual usage. TPB assumes that attitudes, subjective norms, and perceived behavioral control influence the actual usage of innovation [96,97] and stated that behavioral intention to use serves as an indicator of actual usage of technology. Previous studies on the TBP have shown that behavioral intention to use is linked to the actual usage of innovation [97,98]. Digital marketing is an information system that encourages collaboration and interaction through enjoyable use [99]. Ref. [100] argued that usage highly depends on perceived usefulness and enjoyment and proved their significant influence on user behavior. According to [101], their study on digital payment system innovations evidenced the influence of attitude, perceived risk, and behavioral intention on the actual use of digital marketing. Ref. [102] examined the consumer acceptance and use of information technology, and their study witnessed the behavioral intention effect on information technology use.
It has been suggested that the use of digital marketing is critical to business performance today and has a significant effect on sustainable growth [103][104][105][106]. Ref. [107], for example, argued that digital marketing usage improves internal communication, knowledge management, and customer service, which in turn, affect sustainable growth in the SMEs context. Prior studies have already acknowledged the significance of subjective norms for technology adoption [76,81]. Ref. [80] indicated that social norms have important influences on behavioral intentions to use innovation. Thus, other significant perceptions encourage individuals to advance the innovation adoption process. Consequently, a study by [85] described subjective norms as a significant factor in the TPB model, forecasting that subjective norms can also have an effect on both the intended behavior and the actual usage of information technology. In the context of technology adoption, [108,109] noted that subjective norms have a direct effect on actual behavior. Hence, it might be concluded that subjective norms play a crucial role in explaining the intention and actual use of technology. Accordingly, the study proposes the following hypothesis: H5: Subjective norms would have a direct effect on the actual use of digital marketing.
H6: Actual digital marketing usage would positively influence sustainable SME growth.

SMEs Sustainable Growth
According to [76], the adoption of modern technologies has enabled SMEs to keep pace with the recent dynamic business environment. Scholars have argued that the integration of modern technologies, such as digital marketing, by SMEs has resulted in positive outcomes [110,111]. For example, [112] demonstrated that digital marketing has aided SMEs to achieve sustainable growth. According to [113], digital technologies enable firms to be innovative in customizing goods and services, building a customer base, and achieving business growth. Ref. [114] further argued that the use of digital technologies such as social media, content marketing, search engine marketing, and e-mail marketing have helped SMEs improve business performance and remain competitive. According to [115], a firm's sustainability is measured by its ability to react to market fluctuations based on the internal and external environment. In this context, [116,117] argued that digital marketing strategies have a positive association with SME's long-term growth. It has been proven that the adoption of digital marketing allows SMEs to generate ideas from their customers and create value, which in turn leads to sustainable growth [30]. In support of this, [118] provided evidence that digital marketing usage enables SMEs to enjoy superior performance in terms of meeting the needs of customers and enhancing customer service strategy. Consequently, recent [119][120][121][122] studies have demonstrated that the use of digital marketing by SMEs has improved their marketing intelligence and customer relationship management ( Figure 1).

Sample, Data Collection, and Analytic Techniques
Even though the adoption of digital marketing has been recognized in the literature on SMEs, we still know very little about how and how much it influences a country's SME's sustainable growth [123,124]. Considering this, we investigated the hypotheses in the context of SME research by gathering information from the Ghanaian context. In Ghana, the SME sector's accomplishments have long been acknowledged [125]. Ghana's economy grew by 5.4% in 2021, with the services sector acting as the main engine of growth, notwithstanding COVID-19's detrimental effects on the country [126]. This study focused on small and medium-sized enterprises (SME) for data collection. To choose the study respondents and participants, the researchers used a randomized sample technique, particularly a simple random sampling technique [127]. The simple random sampling technique was used because it is free from errors in classification, free from bias and prejudice, and finally, it is very easy to assess the sampling error. The structured questionnaire consisted of two components. The demographic information for the respondents is provided in Section A of the questionnaire, and the study constructs are covered in Section B. To be more precise, the structured questionnaire contains thirty-one questions that were answered by the selected respondents (representatives and owners of SMEs). Once more, a structured survey was created and delivered to SME businesses in Ghana. Since the researchers had in mind of producing substantial results and findings, a sizeable number of questionnaires particularly, six hundred and fifty were administered to the selected SMEs across the country to solicit the needed information for data processing/analysis. Out of the total questionnaire administered, 67 of them were in error whiles others were not correctly filled for the intended purpose. It is revealed that quantitative research with more than 300 respondents is deemed to be substantial for data processing and analysis [128]. After removing the abnormalities and invalid responses, the current study, which included 533 respondents, complies with this condition. In addition, the researchers upheld using both on-and offline methods for collecting data. The usage of both on-and-offline modes of data collection has been used recently. Formal authorization was received from the selected organizations before the commencement of the data collection processes. To obtain some level of actual data that would be helpful to both theory and practice, the study used representatives and owners of SMEs in responding to the questionnaire relying on the comprehensive data in their possession. To be specific, the number of SMEs in Ghana currently are over 1 million covering various economic sectors. The sectors include manufacturing, construction, microfinance, retailing and wholesaling, services, motor trade, communication, fashion and hospitality and agribusiness [129]. By contacting these aforementioned sectors, a simple random sampling technique was applied in the selection of the participant from the list of SMEs. This was to ensure that all the segments of SMEs listed above had a fair chance of being selected [130]. As summarized in Table 1, at the end of the data collection, at least each segment of the SMEs was selected even though some were obvious in the process. The manufacturing, restaurants, communication services, fashion and other sectors in the SMEs setting were selected for the study sample. They were chosen because they primarily used digital marketing tools to fuel their business growth towards its sustainability in the Ghanaian SMEs setting. By employing simple random sampling, five hundred and thirty-three SMEs were randomly selected. Thus, study unit of analysis includes 533 selected SMEs, consisting of 158 SMEs owners, 175 SME managers, 125 IT managers, and 75 other departmental representatives' who were randomly selected. The study selected chose SMEs owners and managers because they make adoption and implementation of technology decisions and are acquainted with internal and external business environment. Moreover, it is significant to clarify that the cross-sectional research design was adopted in the data collection process due to the fact that data was processed and analyzed once in comparison with the longitudinal research design approach.
Additionally, the adoption of the cross-sectional data approach was because of its significance, such as not being costly to perform and does not require a lot of time, used to prove and/or disprove assumptions, and finally, many findings and outcomes can be analyzed to create new theories/studies or in-depth research [131,132]. Before starting the major data collection, a pilot study with 65 participants was carried out to evaluate the constructs' validity and reliability using the anticipated Cronbach alpha values. Additionally, the data collection process took place over four months, specifically from August to November 2022. The respondents used a maximum of eight-to-ten minutes to respond to the indicated questions. The researchers urged the responders not to include any personal information such as names, place of business or work, etc. This is to ensure that the research is conducted under high ethical standards [133]. After removing the incomplete, duplicate, and inconsistent responses from some of the completed questionnaires, the conceptual framework, and finally the study hypotheses, the methodology was finalized using a PLS-SEM, partial least squares and structural equation modeling, specifically, the SmartPLS 3.3 version of the software. Partial least square-structural equation modeling was adopted to be the sole processor of the data and its analysis in this study due to its ability to create extremely complex models and the method's flexibility in terms of data requirements and measurement specifications. The information from the respondents used in this study is detailed in Table 1 below (see Appendix B for the article questionnaire and measurement).

Measurement of the Constructs
When determining the validity of the notions, the researchers drew inspiration from previous works. Hence, the study constructs, such as SME's sustainable growth [134], actual use of digital marketing [109,135], behavioral intention to use digital marketing [49,57,104,136], subjective norms [104,136,137], perceived behavior control (PBC) [57,138,139], attitude towards digital marketing [8,57,140,141] were adopted from past works of literature. A five-point Likert scale was used to assess the study constructs: Completely Disagree (1), Disagree (2), Neutral (3), Agree (4), and Completely Agree (5). To whatever extent the respondent agreed or disagreed with the approach taken to measure the constructs, this was conducted. Since it is quicker and easier for respondents to complete than the open-ended questions, a five-point Likert scale was employed.

Test of Common Method Variance (CMV)
Due to the independent data collection used in the present investigation, shared procedure variance is highly likely. Since the study considers the ethical standards in research, the respondents were assured of data protection in the information provided during the questionnaire. The existence of a common method variance (CMV) (CMB) was established by [142,143]. This discovery prompted the researchers to design the questionnaire with the title page description and to have the highest confidence in the replies of participants. Explicitly, the questionnaire was designed with the option for respondents or participants to opt-out at any point after answering. The researchers initially performed a multicollinearity test using the VIF (variance inflation factor) to verify the presence of common method variance (CMV). Since the thresholds are less than ten (10) as indicated by [144,145], the post-hoc evaluation results show that CMV exists in a tiny number of cases. Finally, the CMV issues raised in this poll are modest, therefore they are not as significant. Other scholars have argued that approaches to dealing with common method effects can be divided into three categories: preventive, detective, and corrective. Preventive techniques, also known as procedural remedies, are approaches that aim to reduce or eliminate the occurrence of common method effects through the incorporation of features into the design of the data collection instrument [146,147]. Detective techniques seek to alert researchers to the presence of common method bias, but cannot quantify its magnitude or provide corrected estimates that have been 'purified' from the effects of shared methods. The most commonly used of these is "Harman's Single-Factor Test", which is also applied in this current study. In this study, it is crucial to note and highlight that there was no problem with common method bias in this data since the total variance extracted by one factor was less than the recommended threshold of 50%.

Model Assessment
Due to the research interest in the scholarly literature on the PLS-SEM application, Jöreskog's Rho (pc) and Cronbach alpha coefficients were used to rigorously test the constructs' reliability and validity as used in current studies [148]. Ref. [148] indicated that when the coefficient values are greater than 0.5, as indicated in Table 2 below, it implies that the construct coefficients are strong and therefore meet the minimum threshold. To measure the psychometric qualities of the constructs, SmartPLS version 3.3 was used. Again, the composite reliability of the constructs, as shown in Table 2 below, indicates that Jöreskog's Rho (pc) and the composite reliability meet the minimal and maximal levels of 0.7 and 0.8, respectively. The composite reliability values for the coefficients' constructs were 0.904 and 0.966, and a baseline threshold of 0.5 was noted for the average variance extracted (AVE), or convergent validity, as shown in Table 2. According to [142], it is important to ensure that the factor loadings of all the constructs are carefully analyzed and loaded to their prospective locations. The current study, therefore, considered making sure that such an assumption is satisfied. Therefore, Table 3 below satisfied this assumption with a threshold of 0.6, indicating the effectiveness of the indicators. Additionally, values such as 0.815 and 0.946, respectively, were recorded as the minimum and maximum loadings of the constructs used. The researchers were also extremely interested in the issue of multicollinearity, and, therefore, used the common method variance (CMV) to discover it when validating the variance inflation factor (VIF). Several studies [149,150] revealed that common method variance is not an issue since the variance inflation factor of the various indicators used below is less as compared to the maximum threshold of ten (see Table 3 below). It is crucial to evaluate the discriminant validity of variables used in a study. To ensure this, [151] motivated the researchers to discover the latent variables of the discriminant validity through the deployment of the 1981 Fornell-Larcker criteria. It is deduced from the table below that all the values on the diagonal, such as 0.892, 0.937, 0.871, 0.907, 0.937, and 0.926, respectfully meet the threshold requirement of above 0.5 as the baseline for its measurement, which also shows the average variance extracted. The essential and rigorous assumptions of the research constructs were developed after the AVE was required to have higher values in comparison to the other constructs, as seen in the discriminant validity table below, under the Fornell-Larcker criteria [152] (Table 4).

Structural Modeling-Path Analysis
The path analysis, also known as structural modeling, was considered in assessing the model's fit. The purpose of this analysis is to demonstrate the causal relationship between the research constructs [152]. Additionally, the estimates of the hypothetical structural path model show that five of the predictions made about the hypotheses of the current study are significant, whereas one of the hypotheses was insignificant. To elaborate more, the regression coefficients of the beta and the significant values (p-values < 0.05) of the research model can be seen in the table below. Additionally, the feasibility of the research model for determining values for the regression model was assessed. As shown in Table 5, the R2 values for intention to use digital marketing, actual use of digital marketing, and sustainable SME growth are 55%, 80%, and 77%, respectively. Again, the results for the CFA, such as model fit, confidence interval, and others, can be seen in Appendix A.2.

Discussions of Results
In recent years, digital marketing has taken center stage in the marketing strategies of the vast majority of businesses due to the unique opportunities it offers. Online presence, as a key proponent of digital marketing, has gained immense popularity in the contemporary circular economy using available emerging tools, particularly the internet. Given the disparities in the effect of this trajectory between developed and developing countries, it is obvious that the latter lack much appreciation of digital marketing for the sustainable growth of SMEs. Consequently, this study investigated the effect of the adoption of digital marketing on SMEs' sustainable growth in Ghana. Through the theory of planned behavior, six hypotheses were formulated to test the effect analysis.
First, the study hypothesized that attitudes toward digital marketing would positively influence the intention to use digital marketing. This finding is inconsistent with [51,63], who observed a positive relationship between attitude toward digital marketing and intention to use digital marketing. Considering the H1 of this current study, a p-value of 0.169 was obtained, which makes the proposed hypothesis not supported as against the reference works [51,63], where accepted p-values of less than 0.05 were obtained. Although these studies found a strong desire for individuals and firms to adopt technology, this current study result suggests otherwise. As mentioned by [59,63], attitude plays an important role in one's attitudinal inclinations, particularly when it comes to the adoption and usage of technology. Attitude, according to [51], is the measure of an individual's belief in a phenomenon with causal effects on the individual's actions. Along this line, [66] had earlier intimated that intentions to use marketing tools significantly relate to the attitudinal tendencies of prospective users. Implying that, the attitude of individuals positively relates to the use of technology, contrary to what the study result suggests. Second, the study hypothesized that perceived behavioral control would positively influence the intention to use digital marketing. This hypothesis is supported by the results of the current study, where a p-value of 0.000 was obtained. While affirming the hypothesis, [68,74] found that perceived behavioral control affects the intention to use technology. Behavioral control has been found to mediate the relationship between intentions to adopt technology [62,70]. The onslaught of mobile marketing among SMEs is gaining traction due to its positive impact on their profitability [62,142]. In the same vein, [75] acknowledged that, while online presence has become a critical strategy for most emerging businesses to keep up with their customers, the phenomenon is linked to the behavioral controls of users. Practically, one's ability and effectiveness in undertaking an action are motivated by a behavioral intention.
Given that an individual's motivations are driven by certain behavioral controls, such actions, according to [76], are contingent on referrals. The decision to buy into the ideal or philosophy of an underlying activity could be socially driven. Hence, the study posited that subjective norms would positively affect SMEs' intentions to use digital marketing. This hypothesis was supported by the findings of [96]. Ref. [97] affirmed that a significant individual's decision to utilize a particular technology is influenced by social norms. Social norms are inherently subjective, and such norms affect an individual's intentions to execute actions [77,80]. This means that the dimension of subjective norms significantly influenced behavioral intentions, indicating that subjective norms positively influence digital marketing usage intentions. [59,94].
Furthermore, the study hypothesized that behavioral intentions to use digital marketing would positively impact the actual use of SMEs' digital marketing. The hypothesis was supported (p-value of 0.000), indicating the significant effect of intentions to use digital marketing on actual use of SMEs' digital marketing. This result is consistent with prior studies [91,94], which corroborated the positive influence of intentions to use digital marketing on SMEs the actual use of digital marketing. Moreover, it also emerged from the findings of [107,129] that intention to use has a strong and positive effect on the actual use of technology. Both studies found that intent to use has a direct effect on actual use, validating the results.
Similarly, the subjective norm was found to have a direct effect on the actual use of digital marketing. H5, which states that a subjective norm would have a positive effect on actual use of digital, is supported by the results of the study obtained, as a p-value of 0.000 was obtained. Intention to use technology is inherently behavioral [84]. The intention is primarily manifested through behavior and an individual's predisposition to adopt a technology. In digital marketing, the intent to act is based on the purpose, which is dependent on certain antecedents or predictors [88,90]. Therefore, it appears that the decision to adopt digital marketing is predicated on the fact that it will facilitate the digital transformation of businesses. Thus, the intention to adopt digital marketing technology is driven by one's motivation. This assertion also implies; the individual's subjective norm impacts their intentions and actual usage of technology. For instance, [86] contends that digital marketing adoption and intention to use information technologies are directly influenced by the individual's subjective norms. This implies that, though subjective norms have a direct effect on behavioral intentions [97], they also have a direct effect on actual use. The present findings also explained that subjective norms influence behavioral intention to use and also play a role in the actual usage of digital marketing.
There is no gainsaying that online presence resuscitates SMEs' sustainable growth. [91] aver that the adoption of digital marketing has engendered SMEs to keep pace with the changing dynamics of contemporary business. Following this, the study hypothesized that actual digital marketing usage would positively influence sustainable SME growth. Evidence in the present study demonstrates that usage of digital marketing has a positive effect on SME sustainable growth, obtaining a p-value of 0.000 and supporting H6. This proposition was supported and also coherent with the outcomes of [114]. Ref. [113], who investigated the role of digital orientation in sustainable innovation among small businesses, for instance aver that the innovative capacity of SMEs is enabled by their quest to increase their market share and become competitive. Besides, evidence revealed in the present study also support [153], as digital marketing technologies such as social media significantly influences SMEs sustainable growth. In addition, a study by [119], corroborates that adoption and usage of digital technologies, particularly digital marketing tools leads to idea generation, hence increasing SMEs performance and business growth. Given that SMEs' growth is the antecedent of competitive sustainability [124], it situates well to assume that the actual usage of digital marketing positively influences their growth. It was found that digital marketing platforms provide effective medium assisting SMEs to achieve business growth through effective customer communication, back-end operations, building customer base and increasing sales turnover. Therefore, it is significant for SMEs in Ghana to consider digital marketing tools as a strategic partner and integrate them to enhance performance, hence achieving competitive advantage and reduce marketing costs. Further, SMEs in Ghana can foster better customer relationships, improve information accessibility and compete in the market using digital marketing. The outcomes of study also show that digital technologies have become an essential element to achieve sustainable growth. To sum up, the effects of digital marketing adoption on SMEs sustainable growth is substantial when SMEs intend to use more of digital marketing tools for business activities and operations, and to achieve sustainable developmental goals. Thus, when the intentions of SME managers and owners are clear towards the adoption and usage of digital marketing, there is the likelihood of SME usage of digital marketing, which significantly increases performance.

Theoretical Implications
This study contributes to the literature on the affordance and impact of digital platforms for businesses. Digital marketing is fast transforming businesses globally, particularly SMEs who are always at the mercy of large firms in terms of competitive advantage. The situation thus spurs SMEs to re-strategize with a focus on online presence. Nonetheless, the SME subsector in most developing economies is beset with myriads of challenges raging from infrastructure to technical and financial deficits. The phenomenon thus triggers an investigation into the effect of digital marketing on SMEs' sustainable growth. Thus, this study becomes one the first to explore the relevance of digital platforms in the competitive sustainable growth of firms. Given that, the adoption of technology is inherently behavioral, this study explored the underlying goal through the theory of planned behavior [39].
Theoretically, the theory has offered the study a mammoth of understanding to articulate how behavioral tendencies inform SMEs in their adoption of digital platforms for the sustenance of firms. Thus, the current study augments the SMEs digital marketing adoption literature. Besides, it strengthens the SMEs managers/owners understanding of digital marketing as a tool to drive their sustainability. The study findings found a significant impact of perceived behavior control and subjective norm on behavioral intention, although the direct relationship between attitude and the behavioral intention was insignificant. Again, the study contributes to the existing literature by examining the subjective norm and actual behavioral use of digital marketing relationships.
Moreover, this study result has significantly unboxed the behavioral tendencies that watershed the decision to adopt digital platforms to engender SMEs' online presence towards sustainable growth. Digital marketing has been considered as an innovative technology for SMEs development, the study confirmed that digital marketing adoption has positive effect on SMEs sustainable growth in developing economies. This present study provides in-depth examination and enriches research on digital marketing adoption and SMEs sustainable growth empirically through the TPB theory. More importantly, the study added to the body knowledge by arguing that SMEs can achieve the current sustainable development goals via technological innovation.
The study has also added to the literature on the behavioral tendencies among SMEs' sustainability which is often under-explored. Our preliminary search shows that the adoption of digital marketing with the special goal of enhancing SMEs' online presence, particularly among developing countries like Ghana is scanty. Thus, this study adds to the existing knowledge on sustainable SMEs in developing economies setting.

Practical Implications
Practically, this study brings to the doorstep of managers of SMEs the need to rethink their motivations in the adoption of digital platforms purposely for marketing their goods and services. For instance, the study results showed that perceived behavioral control and subjective norm impact the intention to use digital marketing platforms. This is instructive, suggesting that managers of firms are given their behavioral tendencies and social pressure [72]. Thus, managers of SMEs in their quest to adopt digital platforms would be concerned about how the application of the technology will drive the needed behavioral norms to help improve their profitability and sustainability. Furthermore, the present study outcome suggests that SMEs that actively utilize digital marketing will achieve competitive advantage, improves customer-firm relationships and sustainable growth. As a result, SMEs will be able to reach a significant number of customers, interact with them effectively and exploit other opportunities essential for business growth. The findings of the analysis, moreover advanced that digital marketing has a strong positive impact on sustainable growth through enhancing market share, innovative practices and offer options for choosing sustainable innovations, which enabled SMEs to improve business growth. In addition, the study proposes that SMEs can successfully generate ideas and develop new practices through technology and innovation. Thus, the study findings empirically support SMEs to adopt and use digital marketing tools for business operations and survival and further highlights the essence of its adoption and implementation. Meanwhile, SMEs must focus on strengthening marketing strategies through usage of digital marketing tools to offer products to customers, monitor potential customers and competitors, and build customer satisfaction, leading to sustainable growth. This is significant to the SMEs in developing economies given their vulnerabilities to economic shocks that often relegate them from their core businesses. The study amplifies the need to seek the appropriate technologies to meet the sustainable needs of shareholders and customers. On the other hand, the current study findings proved that SMEs can quickly adapt to the changing business environment and become competitive via digital marketing adoption, which offers various platforms to improve business performance, hence sustainable growth. Profitability is the core of every business as proffered by leading strands of research. Through digital marketing mechanisms, digital platforms bolster the competitive sustainability of SMBs, which is arguably the most important benefit.

Conclusions
This study investigated the impact of digital marketing on the sustainable growth of SMEs in Ghana. Through the lens of the theory of planned behavior, the study developed six hypotheses aimed at generating answers to the underlying objective. The questionnaire was administered to 533 owners of small and medium-sized enterprises (SMEs) in Ghana using SmartPLS version 3.3 for data analysis. Out of the six hypotheses, five were supported. This study establishes that attitude towards digital marketing has no significant and direct effect on the intention to use digital marketing. Nonetheless, perceived behavior control and subjective norm were found to affect individuals' intention to use digital marketing. The study also tested the relationship between the intention to use digital marketing and the actual use of digital marketing, which was moderated by the subjective norm. More importantly, the study findings concluded that digital marketing usage has a direct and positive effect on SMEs sustainable growth. The reasons for this significant effect can be ascribed to the effective usage of digital marketing technologies, leading to increased customer-base, improved relationships and performance. This study contributes to the multiplicity of factors that influence the behavioral tendencies of managers of firms in their quest to adopt digital platforms to enhance their sustainable growth. The present study further suggested marketing strategies that would benefit and educate SME owners and managers with regards to behavioral factors that stimulate digital adoption, leading to effective adoption decisions. Additionally, the study acknowledged the relevance of digital marketing in responding to dynamic business environment. This study suggests that essential elements of digital marketing is expected to help drive SMEs business pace to support the country's economy. It is further concluded that digital technologies should be incorporated into SMEs marketing strategies for effective promotion of goods and services, continuous communication with customers, to innovate and tackle the global challenge of SME's sustainable growth.
Thus, SMEs in Ghana should adopt digital marketing tools such as e-marketing, social media marketing, search engine marketing, and content marketing to create awareness and to compete in the dynamic and competitive market. The study results serve as guidelines for prospective adopters of digital platforms to engender their sustainability strategies. Again, the current study findings could be helpful and be an initial guideline study for researchers interested in SMEs' sustainability in the Ghanaian context. This study would aid scholars in developing a general framework for adopting digital marketing in the SMEs context.

Limitations and Future Research Directions
The study presents limitations that create avenues for future researchers. First, our research was conducted within a certain geographical context, hence limiting the study. Therefore, the results of the study cannot be generalized. Second, although the developing economy contests ideas in identifying the major behavioral factors that impact the adoption of digital marketing, it suggests that the case may be the same in other economic contexts. Thus, a comparative study could be useful in understanding the mechanisms of digital marketing in both contexts to inform knowledge. Third, the types of SMEs used in this study may not also be comprehensive, thus, another segment of SMEs could be used to give the phenomenon another perspective. In addition, future research could examine large organizations in emerging economies utilizing the same constructs and test the validity of the present study. Further, the present study did not explore the risk implications of digital marketing for SMEs. Therefore, it is recommended to the future researchers explore some of the consequences of using digital marketing; and could also explore using a qualitative approach in further studies.