The Key to Sustainable Economic Development: A Triple Bottom Line Approach

: Concerns about improving social, environmental, and economic living standards are the basis of the triple bottom line (TBL) link to economic development (ED). Aware of the importance of studying their relationship, this article analysed the inﬂuence of TBL on ED. A quantitative methodology was used. The sample comprised a panel of data from 2006 to 2019 for OECD (Organisation for Economic Co-operation and Development) countries. Five multiple linear regression models were estimated by the generalised method of moments. The results of this study revealed that the social dimension of TBL boosts ED, the environmental dimension of TBL slows down ED, and the economic dimension of TBL contains conﬂicting synergies in ED. The Human Development Index (HDI) should now include indicators of environmental wellbeing. Governments should adopt policies to improve social wellbeing to boost ED, work to coordinate the objectives of environmental protection and ED, and combat vulnerabilities arising from public debt. As one of the ﬁrst studies to assess the inﬂuence of TBL on ED at the country level, the present ﬁndings contribute to the reﬂection about the inﬂuence of TBL on a country’s ED and strengthens the discussion around the inﬂuence of different dimensions of TBL. social dimension of TBL have a positive inﬂuence on economic development in OECD countries.


Introduction
The global COVID-19 pandemic, in addition to political and economic uncertainty, has brought social and economic costs that will be felt in the coming years [1]. It also brought fluctuation in the prices of natural resources commodities [2]. Price instability, limited availability of natural resources, and the pandemic have caused many countries to face an energy crisis [3]. This has made it even more evident that the development of sustainable initiatives is vital for sustainable economic development [4]. Thus, it is extremely important to understand the role that sustainability plays in economic development (ED).
This study assumes that sustainability must be perceived according to the triple bottom line (TBL) construct. TBL, outlined by Elkington in 1996, assumes that value creation results from three dimensions, social, environmental, and economic, which must be accounted for [5][6][7]. It has at its core the support and management of activities that privilege development [8]. It has gained traction at all levels of government and in business [9]. Economic development (ED) is created by the process of creative destruction [10] and translates into an organic system of successive qualitative changes [11]. It is responsible for sustainable development, at country level, in the long term [12]. It is also at the country level that there is an obligation of harmony in the management of resources, be they social, environmental, or economic [13,14]. These are concepts that share particularities in their very nature. With the aim of improving understanding and effective action in relation to sustainable development, the United Nations announced the 2030 Agenda of Sustainable Development Goals [15]. The integrative nature of these objectives revealed the need to study the relationship between the adopted actions and the results obtained [16]. Therefore, it is essential to monitor and evaluate the sustainable development of countries [13]. Furthermore, the development of TBL has highlighted the need for studies that approach it in a more holistic way [7,[17][18][19]. However, despite recognising the importance of TBL in ED, it has been given little attention in this scientific field [17].
To fill this gap, this study analysed the influence of TBL on ED, in the timeframe from 2006 to 2019, in the 38 countries of the Organisation for Economic Co-operation and Development (OECD). A quantitative methodology was used. After the statistical analysis of the variables, the hypotheses were tested through the estimation of five multiple linear regressions, using the generalised method of moments (GMM). No evidence was found of any previous study that considered an analysis encompassing the influence of TBL, specifically involving the integration of their social, environmental, and economic dimensions, as well as the categories that constitute them, on ED. Although there have been some studies on the link between TBL and ED, there is still no study ascertaining the influence of TBL on ED in OECD countries. In fact, when focusing on articles that consider TBL and ED at the country level, only a cross-country comparison [13] and an assessment of the sustainable performance of each country [14] were found. Extant research has made it possible to adopt a research model that allows a new understanding of the actions that influence economic development. This study adds new perspectives to previous discussions. It identifies the social dimension of TBL as a driver of ED, the environmental dimension of TBL as an element that slows down ED, and the economic dimension of TBL as having conflicting synergies in ED.
The structure of this study is as follows: after this introduction, where the general objective is presented, there follows a literature review that encapsulates the hypothesis development. This is followed by a description of the methodology, data, and variables. Then, the results obtained are presented and discussed, after which the conclusions, limitations of the study, and future lines of research are presented.

Economic Development
For Schumpeter [10], the process of creative destruction, the result of disruptive innovations, is responsible for the creation of ED. ED is an organic process represented by a qualitative change in constant evolution [11]. Despite the wide acceptance of the term economic development, there is intense discussion about its definition [20] and its objectives [21]. According to Lele [22], ED can be seen as a method that seeks change and its definitions relate to both the targets of that procedure and the expedients that seek to achieve those targets. For Lee [20], ED is about the process of gradual mutation of an economy. Long-term theories of ED have the agglomeration of human capital and population growth as the central forces on which it is based [23]. For the endogenous growth theory, ED has its centre in the productive capacity and the application of knowledge, by large firms, with the possibility of investing in human capital and research [24].
The vision of Seers [25] should also be mentioned, who sees development as the elimination or reduction of inequality, unemployment, and poverty. According to Owens [26], development happens when there is a development of people and not a development of things. Daly [27] started from the dictionary meaning of development, expanding or realising potentialities with a view to an improvement of the condition, describing the development as a qualitative improvement or an unveiling of potentialities.
ED's mission relates to the long-term achievement of sustainable development in the countries' life model [12]. ED has in the financial sector one of its drivers [28]. It is a system that integrates resources, leads to urbanisation, and carries with it consequences for public health [29]. It drives the process of industrialisation [30] and, in several studies, it has been suggested that it is not always on a sustainable path [31]. It is supported by micro-enterprises [32], is impacted by cultural characteristics [33], and is stimulated by financial inclusion [34]. Furthermore, the way a community understands and masters production techniques, especially in relation to the most relevant markets, can be perceived as ED [35].
There is a long-standing concern among economists about the different factors that can impact the direction of a country's ED [36]. For [17], when studying the differences between ED and economic growth, ED was usually referred to as a change in the economy that aids economic growth or qualitatively improves the social conjecture, which results from economic activity, whereas economic growth was mentioned as a change in the size of the economy. Not infrequently, economic progress is gored by the lack of action and agreement about the measures required [12].
The thinking that ED policies endanger environmental sustainability began in the 20th century and led to the adoption by the United Nations of the concept of sustainable development [37]. This concept has two cores: meeting the needs of society, particularly the poorest, and the difficulties posed to the environment by society's behaviour and technological progress [38]. No definition of development gathers the consensus of all people since development is intimately linked to human wellbeing, and this is a concept that includes multiple dimensions subject to undeniable trade-offs [39]. Thus, the ideological choice of this study must be clarified, and it is related to the notion of development adopted by the United Nations. In other words, ED brings together the concern with increasing income to meet basic needs, eradicating poverty, and preserving the environment. It should be considered to constitute three dimensions: the economic, the social, and the environmental.
Human Development Index (HDI) Several ways of measuring the level of ED have been elected such as through GDP per capita [40], using a ratio of a country's GDP (China) to global GDP [41], and considering the Genuine Progress Indicator or the Index of Sustainable Economic Welfare [42]. Among the composite indicators of socioeconomic development, the HDI is the most commonly employed [43].
The United Nations Development Programme developed the HDI, a development measurement tool that considers economic and social advances [44]. Mahbub ul Haq was the Pakistani economist who led the team that invented it and presented it in 1990 in the first Human Development Report [45]. Born out of the desire that policy focus should be on people and not on national economic accounting, the core of countries' development, the HDI aims to estimate the progress of nations, considering not only economic expansion but also important social outcomes [46]. Thanks to its multidimensional nature, it measures the development of nations along several lines [47]. It is calculated as the geometric mean of standardised indicators representing each of the key dimensions of human development: a healthy and long life, access to knowledge, and an adequate standard of living [46,47]. Table 1 details the dimensions, indicators, and sources of HDI data, adapted from UNDP TN [48].
Togtokh [49] believed in the merits of HDI when it comes to development and quality of life. However, he also reminded us that there is a presumption of the limitlessness of natural resources and that not enough attention is paid to the changes that are caused to the planet by development. However, the HDI is an inclusive metric of the basic life factors seen as an explanatory indicator of the ED [50,51].
It can translate the level of quality of life [52,53] and reflect it better than GDP [54]. In addition to this, it has been instrumental in spreading the discussion of ED beyond the purely monetary scope [55].

Triple Bottom Line
The concept of TBL, designed by Elkington, emerged in 1996; it sees companies or organisations as value creators in multiple dimensions that must be accounted for [5]. It has, at its core, supported and operationalised the implementation of sustainable development [8]. TBL is also presented as the three Ps: profit, planet, and people [56]. It consists of three dimensions: economic, environmental, and social [57]. That is, to the traditional economic results, the environmental and social dimensions have been added to calculate the business performance in its sustainable interpretation [58]. It is the fruit of the growing awareness of the problematic that involves sustainability and to which the World Commission on Environment and Development of the United Nations Organisation contributed substantially when it published in 1987 the report "Our Common Future", known as the Brundtland report [59]. The TBL was legitimised by incorporating into its measures the concerns with the future of people (inside and outside the organisations) and the planet [60]. It suggests that companies' involvement in socially and environmentally responsible conduct is necessary and can result in financial gains [61]. Financial gains can also result from activities at the intersection of companies' economic, environmental, and social performance, synonymous with competitive advantage and long-term economic returns [62]. Being usually well received, the TBL framework is useful for finding answers for organisations seeking a path towards sustainability [63].
To measure TBL, the Sustainable Society Index (SSI) was used. Since 2006, the Sustainable Society Foundation of the Netherlands has developed the SSI [64]. Since 2018, the responsibility for editing the SSI has been passed on to the Technische Hochschule Köln [65]. It is a composite index covering the three main domains of sustainability [66]. Its component indicators are 21, assessed on a scale of 0-10 and a biannual basis [67]. They measure the distance to full sustainability for each indicator representing the three categories of environmental/ecological aspects, quality of life, and resource depletion [68]. The differential weighting of the indicators has no scientific basis; thus, there is equality in their consideration when aggregating them across the three dimensions [69]. Following the advice of the Joint Research Centre of the European Commission, the SSI is not a single overall index as the three dimensions are not aggregated [69]. In a simple and transparent way, the SSI integrates the most important aspects of sustainability [70]. Compared with other indices, the SSI considers a larger number of basic indicators and components of sustainable development; its data cover many countries and are readily available [64]. In addition to measuring the level of sustainability, the SSI monitors progress towards sustainability [71].
At the country level, the need for the existence of a concordance between the administration of social, environmental, and economic resources can be identified [13,14]. Thus, it may be asked whether the different dimensions of TBL influence the countries' ED in a positive way; the following hypotheses were formulated:

Social Dimension
The social dimension refers to the social elements of the community and employees who are the recipients of the outcome of the business exercise [72]. It translates into an ethical standard of behaviour for the longevity of humanity [73]. Social sustainability works especially with human beings and social capital orientation, aggregating civil and human rights, community and social responsibility, safety and health requirements, employment, and public perceptions [8,74]. Standard of living, human capital, equality, living standards, and prosperity can be included in social indicators, although these have a subjective genesis [75]. For Schönborn et al. [72], it is acceptable to assume that social sustainability can be mirrored in a corporate culture characterised by primary values and assumptions that are underpinned by the idea, scope, and principles of social sustainability. When thinking about corporate culture, it should be kept in mind the seed for reflection left by Zott [76], who sees the business model as a set of interdependent activities that exceed both the company's focus and its limits, enabling stakeholders to create and appropriate part of the company's intrinsic value [76]. The need to measure and compare social value creation [77] and the pursuit of ways and models of social value creation have already been germinated in several studies [78][79][80][81]. However, there remains a lack of studies that expand the range of measurements and assess the impact of social value [81][82][83][84]. In this context, the following hypothesis was formulated: H3. The categories (a) basic needs, (b) personal development and health, (c) balanced society, of the social dimension of TBL have a positive influence on economic development in OECD countries.

Environmental Dimension
In turn, the environmental dimension seeks that the global systems that support life be secured indefinitely [85]. It embraces the management of limited biophysical resources by managing them and seeking their reduction in processing [86]. The view that environmental sustainability is a constraint on the economic strength of business and a luxury has changed [87]. The aim of this concept is the simultaneous achievement of economic development and environmental sustainability [88]. The link between corporate and environmental performance is impacted by the heterogeneity of organisations' ability to manage the various aspects of their operations [89]. It should be noted that environmental performance has consequences for the stakeholders involved in the company's operations [90]. Market players create pressure for companies to operate in an environmentally conscious way [89]. As consumers become more aware, the pressure for organisations to change their value creation process increases [91]. Multinationals are at the top of the competitive and social pressures to adopt environmental and sustainable strategies [92]. Environmental associations and governments are increasingly highlighting all problems linked to the environment [93]. Humanity's survival is directly linked to the achievement of environmental sustainability, which is one of the most pressing concerns all over the planet [86]. In this way, the following hypothesis was formulated: H4. The categories (a) natural resources and (b) climate and energy of the environmental dimension of TBL have a positive influence on economic development.

The Economic Dimension
The economic dimension concerns the outcome of the company's business performance in the economic system [5]. It is truly fixed in the culture of companies as profit is the main objective of their activities [94]. It is commonly accepted that economic sustainability is ethically based on the search for justice in the forum of human-nature relations in a perspective of an uncertain and long-term future [90]. The organisation's growth is linked to the growth of the economy by the economic line and the quality of its contribution in its support [95]. In other words, this dimension focuses on the economic values made available by organisations to the environment in order to provide prosperity and support for future generations [95]. Thus, the economic dimension is one of the subsystems of sustainability that facilitate survival and evolution towards the future [96]. In several contexts, it is given more importance [97,98] because it translates more directly to the interests of companies [99]. It is a vital element of their existence [100], while the other two dimensions (social and environmental) reflect the actions of the company towards third parties [101]. However, little information is available on the economic sustainability of the economy [96]. Knowing that economic growth can have adverse effects on society [102], it is imperative to understand whether the influence of the economic dimension of TBL on countries' ED is positive.

Sample
Starting from the main objective of analysing the influence of TBL on countries' ED, a sample of 38 OECD countries and the period from 2006 to 2019 were considered.
HDI data were collected from the United Nations Development Programme [103] and SSI data from the Technische Hochschule Köln [65]. HDI was used as a proxy for ED, which was previously used as the dependent variable by authors Hussain and Dey [104] and Zelenkov and Lashkevich [105]. The three dimensions (human wellbeing, environmental wellbeing, and economic wellbeing) and the seven categories (basic needs, personal development and health, well-balanced society, natural resources, climate and energy, transition, and economy) of the SSI represented the TBL and were the independent variables. These SSI variables as measures of TBL were used by authors Larson [69] and Rodríguez-Rosa et al. [106]. Table 2 contains a description of the dependent and independent variables.

Methods
As the sample involved panel data, a quantitative methodology was used, as described by Jain and Nagpal [107] and Mance and Kruni [108]. Firstly, a statistical analysis of the dependent and independent variables was conducted. Then, the formulated hypotheses were tested through the estimation of five multiple linear regressions, using the generalised method of moments (GMM). GMM was proposed by Arellano and Bond [109] and later developed by Arellano and Bover [110] and Blundell and Bond [111]; allows obtaining efficient estimates. This method is extensively used when dynamic panels constitute the sample because it is asymptotically normal and consistent over large samples, demanding no specification of the distribution of error terms [112,113]. It also allows dealing with autocorrelation problems typical of this type of sample, as well as with the potential presence of endogeneity and heteroskedasticity [114][115][116][117][118][119]. In addition to providing information about the dynamic behaviour of an individual, it increases the accuracy of estimates [120][121][122].
The estimated models were assumed to be based on Equation (1).
where Y it is the HDI as a measure of economic development, Y it−1 is the lagged HDI variable for the country i in the period t − 1, Z denotes the 10 independent variables concerning the three dimensions and the seven categories of the SSI, µ represents the unobserved effects at the country level, and e is the error term. Table 3 contains the statistical description of the dependent and independent variables. The sample consisted of 304 observations from 2006 to 2019. The minimum value of the dependent variable HDI was 0.70 in Colombia in 2006, while the maximum value was 0.96 in Norway in 2019; the mean was 0.88 and the median was 0.90. The low value of the standard deviation of 0.054 makes it evident that a large number of the countries in the sample were clustered around the mean.

Results
Regarding the independent variables, and considering the dimensions of the SSI, it was observed that the HuW had its highest value in Finland, i.e., 9.10, and its lowest value in Colombia, i.e., 5.57; its average was 8. Regarding C & E, the highest value was seen in 2014 in Costa Rica with 6.62, the lowest was seen in 2006 in Luxembourg, and the average was 2.89. Tr had its highest value of 9.51 in Sweden in 2016, its lowest value in Colombia in 2019, and an average of 6.6. Lastly, Ec had its highest value of 8.69 in Norway, its lowest value in Greece in 2018, and an average of 5. 67.
The formulated hypotheses were tested in the Eviews10 software (from IHS Markit, Irvine, United States of America) and five multiple linear regression models were estimated (Table 4). Model 1 considers the three dimensions of SSI aggregated, while model 2 considers the disaggregation of the three dimensions of TBL into seven categories of SSI (three of the social dimension, two of the environmental dimension, and two of the economic dimension). Model 3 is made up of the three categories that make up the social dimension of SSI; model 4 is made up of the two categories that make up the environmental dimension of SSI; model 5 is made up of the two categories that make up the economic dimension of SSI. Table 4. Results of panel generalised method of moments dependent. In model 1, the influence of the social, environmental, and economic dimensions on the HDI when aggregated was analysed. It can be concluded that only the social dimension had a positive economic influence on HDI in OECD countries. The results showed a significant and positive influence of human wellbeing on HDI (β = 0.043). On the other hand, the relationship between HDI and environmental wellbeing was significant and negative (β = −0.016). Lastly, the relationship between economic wellbeing and HDI was not significant. Thus, Hypothesis H1a was confirmed, but Hypotheses H1b and H1c were rejected.

Model 5 Economic Dimension
Turning to the categories that make up each of the three dimensions of the TBL, model 2 was used to analyse the breakdown of the dimensions into seven categories. It was found that the categories that concern the social and economic dimensions had a positive influence on HDI, while those that represent the environmental dimension did not have a positive influence on HDI. That is, the basic needs variable had a positive influence on HDI (β = 0.056); the personal development and health variable also had a positive influence on HDI (β = 0.066); lastly, the well-balanced society variable also had a positive influence on HDI (β = 0.005). Thus, Hypotheses H2a, H2b, and H2c were accepted. Regarding the variables of the environmental dimension, the variables of natural resources and climate and energy had a negative influence on HDI (β = −0.002 and β = −0.010, respectively). Thus, Hypotheses H2d and H2e were rejected. Lastly, regarding the variables representing the economic dimension, the transition variable had a β of 0.002, and the economy variable had a β of 0.002. That is, they had a positive influence on HDI, leading to the acceptance of Hypotheses H2f and H2g.
According to model 3, where only the aggregation of the categories that represent the social dimension of TBL was considered, it was found that they had a positive influence on HDI. That is, the variable basic needs had β = 0.080, the variable personal development and health had β = 0.057, and the variable well-balanced society had β = 0.008, leading to the acceptance of Hypotheses H3a, H3b, and H3c.
In turn, in model 4, which only considers the aggregation of the categories that translate the TBL's environmental dimension, the variables did not have a positive influence on the HDI. That is, for the variable natural resources, β = −0.011 was found, whereas, for the variable climate and energy, β = −0.019 was found. Thus, Hypotheses H4a and H4b were rejected. Lastly, in model 5, which observes the behaviour of the categories representing the economic dimension when aggregated, the variable transition had a positive influence on HDI (β = 0.010), whereas the economy variable was not statistically significant. Therefore, hypothesis H5a was accepted, but H5b was rejected. Table 5 presents a summary of the results.

Discussion
Human wellbeing encompasses categories that consider the satisfaction of the population's basic needs, personal development, and the health and balance of society. Therefore, it is easy to understand that this dimension has a positive influence on HDI, as found in the study, as activities that provide the attainment of satisfaction of these categories are themselves drivers of economic development. Statements from studies prior to this stated that food insecurity is higher in low-income countries [123,124]. Cultural characteristics have the power to affect ED through the activity of institutions [33]. Moreover, the integration of girls into education [125], female empowerment [126], and education [127] have a positive outcome on the generation of ED. Health efforts also promote a healthy and productive population [128].
Environmental wellbeing consists of two categories, natural resources and climate and energy. Environmental protection has been perceived as an obstacle to ED [129], which is not a consensual idea [130]. The results indicate no positive effect on HDI when environmental wellbeing increases. This finding is in line with the study of Lai et al. [131], in which ED suffered negative effects from environmental protection. Furthermore, Peng et al. [130] concluded that environmental protection could slow down ED in the short run. However, there is a growing awareness on the part of governments that ED can be negatively affected by climate change [132].
The effect of economic wellbeing on HDI was not statistically significant, which may be explained by the conflict that its indicators carry and that translate into the conflicts between economic growth and economic development. The economic dimension denotes the concern with profit to the detriment of environmental and social concerns [101]. When analysed, it can be seen that it represents growth measures whose nature is quantitative and that it does not translate the level of the quality of life in society [102]. Furthermore, the improvement of economic indicators is not achieved without costs to the environment [133]. There are a series of problems resulting from economic growth [134].
Turning to the categories that make up each of the SSI dimensions, these categories were analysed in different models. Starting with the categories that make up human wellbeing (basic needs, personal development and health, and a well-balanced society), through this study, it was found that their influence on ED was positive. This was the case whether they were analysed together with the other SSI categories (model 2) or when they were chosen as the elements that make up model 3, reflecting the social dimension of TBL. Thus, the basic needs category, encompassing the indicators of sufficient food, sufficient to drink, and safe sanitation, had a positive influence on the ED. The possibility of access to safe water provides enormous opportunities for ED [135]. Safe sanitation is elementary for ED, and its implementation is a good investment [136,137]. The personal development and health category had similar behaviour, influencing ED positively in both models. This category was composed of the indicator's education, healthy life, and gender equality, and it had a positive influence on ED. In fact, the results reinforce the results of Pan [138], stating that ED can be stimulated by the government through the expansion of its investment in education. Education is a basic condition for rapid ED [139]. An increase in life expectancy brings a higher return [140][141][142]. ED can be promoted by gender equality, and accounting for its multiple dimensions is vital for ED [143]. The well-balanced society category aggregated income distribution, population growth, and good governance indicators. It also had a positive influence on ED in both models, corroborating previous findings. In line with these reflections are those of Tian and Li [144], who considered income distribution as a crucial element that influences welfare and social stability, as well as of Dutt and Tsetlin [145], who saw high degrees of inequality as having a corrosive influence on ED. The population growth indicator reflected that for resources, nature, and food supply, a decrease in population would be positive. Its positive influence on ED is in line with the claims of Bloom et al. [142], who argued that a decrease in the number of children leads to an increase in income in the short and long term, and Baldanzi [146], according to whom a lower rate of population growth is related to faster economic growth. There is also empirical evidence that the quality of political institutions highlights ED [147] and promotes it [148].
Attention is now given to the categories that make up environmental wellbeing. Here again, they were analysed from two perspectives: together with all other SSI categories (model 2) and as representatives of the environmental dimension of TBL (model 4). These categories were as follows: natural resources (with the indicators biodiversity, renewable water resources and consumption) and climate and energy (energy use, energy savings, greenhouse gases, and renewable energy). The results of these categories had a negative influence on ED. Natural capital puts pressure on human capital and reduces the speed of ED [139]. Lai et al. [131] concluded that ED suffers negative effects from environmental protection, and Duan et al. [149] assumed that protected environmental areas have a negative effect on income and increase inequality.
Lastly, the economic wellbeing dimension encompassed two categories: transition and economy. Model 2 encompassed a study considering all categories and their positive influence on ED. In the model in which they were considered isolated and as representatives of the economic part of the TBL (model 5), the transition category had a positive influence, while the economy category is not statistically significant. The transition category consisted of the indicators organic farming and genuine savings. Earlier evidence that organic farming may constitute an opportunity for ED was found [150], and its adoption is subject to monetary considerations [151]. On a national level, genuine savings represents a key indicator for ED [152,153], and, when underpinned by environmental quality and natural capital assets, it results in increased wealth [154]. In certain circumstances, it precedes economic growth [155]. The economy category considered in model 2 had a positive influence on ED; however, when considered in model 5, it was not statistically significant. Bear in mind that this dimension mirrors the indicators GDP, employment, and public debt; thus, it is easy to agree with Schumpeter's view that finance has great importance for ED and improves economic efficiency [156], and that, in relation to employment, when there is a qualitative increase in the production of employment, economic complexity also increases and the countries which achieve this have a favourable ED [35]. In relation to public debt, there is a discussion about whether or not it is an obstacle to economic development since it may limit or condition the actions of governments, because, when public debt is high, it constitutes a restriction to economic development [157].
Reflections of Zapf [158] should also be considered because, although this study was longitudinal, it could be assumed that a link between the ED and the variables adopted as representatives of the TBL may exist. In this case, it is possible that ED itself influences the behaviour of the TBL dimensions and the studied categories. In addition to this, there may be other variables that can influence the dependent and independent variables, which will produce a relationship between them.

Conclusions
The TBL approach is central to the progress of ED, and little attention has been paid to it [17]. This study aimed to analyse the influence of the triple bottom line (TBL) on economic development (ED). It can be concluded that the social dimension of the TBL has a positive influence on ED, the environmental dimension has a negative influence on ED, and the economic dimension of the TBL, not having a positive influence on ED in all the analysed aspects, is a translator of conflicting synergies.
It should be noted that the fact that the model not only represents the aggregated dimensions of the TBL, but also the aggregation of the categories that were elected as constituents of the TBL, as well as the individual consideration of each of the dimensions, allowed the conclusions to be supported by more detailed reflections. This allowed for a better translation of the spirit of the hypotheses made.
This study considered HDI as a proxy for ED, and this indicator encapsulated some limitations that were reinforced by the results. It becomes even more evident the need for theoretical reflection to consider the inclusion in the HDI of indicators that translate the environmental dimension into the ED. The biocapacity of forests, cropland, grazing land and fisheries, and carbon emissions [159], CO 2 emissions per capita [43,160,161], or CO 2 emissions and material footprint [46] could be some examples of indicators.
Despite the contributions of this study, it is not without limitations. It is possible that a reversed causation problem exists and that unobserved factors that simultaneously affect TBL and ED were not considered. In future studies, this causal relationship between TBL and ED should be further investigated. The use of SSI to measure TBL and of HDI to measure ED instead of other variables may have biased the results. Additionally, the choices made when performing the econometric techniques may have influenced the results, as suggested by Dogan and Turkekul [162].
To broaden the understanding of the influences of TBL in ED, future research should take a three-pronged direction. That is, in order to seek avenues that solidify the driving role of the social dimension of TBL in ED, the factors that influence social sustainability should be investigated. Bearing in mind that the planet's finite natural resources are the glue that binds societies and generations, the role of the environmental dimension of TBL needs further exploration to assess the conditions that affect environmental sustainability. Lastly, it should be noted that it is vital to clarify the direction of the forces that drive the economic dimension of TBL. Therefore, further analyses need to be carried out to explain the drivers of economic sustainability.

Managerial Implications
This study contributes to the understanding of the influence that TBL and each of its dimensions exert on ED. This urgent and necessary understanding contributes to the alignment of measures that must be taken so that sustainable development goals are achieved. It should be noted that supporting the progress of the social dimension of TBL is not only a guarantee of a qualitative improvement in the lives of populations but also a driver of ED. Thus, governments should consider investments in projects that increase the level of human wellbeing as a way of stimulating ED. Policies are also needed to improve coordination between environmental protection and ED objectives so that conflicting synergies between these two forces can converge and improve the ED framework. Governments should also assess and address vulnerabilities arising from high public debt to increase their capacity to implement policies that foster ED.

Practical/Social Implications
This study highlighted the need for the academy to contribute to the reflection on the best paths to take towards an ED that must be sustainable, and that represents not only a struggle for survival, but also the concerns of social, environmental, and economic justice. It strengthens the link between TBL and ED by showing the need for the evolution of TBL to this academic field.
TBL aims to create a sustainable base (social, environmental, and economic) that can be enjoyed fairly. It is on the basis of this foundation that an ED that focuses more on the general wellbeing of populations than on the mere sum of advances in economic growth can be created. It is, therefore, imperative to expand the study of TBL to include ED, to which this analysis contributes, reducing the scarcity of studies that relate these two themes. It also reduces the lack of studies considering TBL and ED at the country level. Furthermore, the investigation of the influences of the TBL dimensions on ED adds new perspectives to earlier discussions. It also identifies the social dimension as inciting ED, the environmental dimension as decelerating ED, and the economic dimension as encompassing conflicting synergies in ED.

Conflicts of Interest:
The authors declare no conflict of interest.