4.1. Annual Scientific Production
Table 3 depicts the annual scientific production. Over the 21 years of articles published on consumer behavior and sustainability in e-commerce, the 104 articles were cited 1433 times, with an average of 13.78 per article. The first article published related to the topic was the work by Malaga [
50], who explored the costs to the consumer of participating in e-commerce compared to the costs of traditional retail outlets. Since 2001, 21 years of publications have been citable. The mean of total citations (TC) per year (mean of TC per article/number of citable years) was 0.65, and the mean of citations per article was 13.78.
The number of TC is mainly influenced by the most recent years. Since 2015, 92 articles have been published, resulting in 1202 citations, 83.9% of the total. The year with the highest number of citations was 2019, with 264 citations. The works that most contributed to the 2019 record were the articles from Yang et al. [
51], with 52 citations, followed by the articles from Rai et al. [
52] and Xiao et al. [
10], both with 37 citations each. The year 2019 was also the most averagely cited year. Nevertheless, the most cited paper was published in 2015 [
28], which alone was cited 198 times. Piscicelli et al. [
28] developed a case study applied to an online marketplace for peer-to-peer sharing, aiming to recognize the role that consumer values have in the acceptance, adoption, and diffusion of collaborative consumption.
Since 2001, the number of publications has reduced including years with no publications. In 2013, a steadily growing interest was observed in the topic. However, a real interest started in 2019. This was the year that the number of publications surpassed the two-digit barrier. Since 2019, 78 articles have been published, representing three-quarters of the total, and a continuously growing trend can be observed. It should be noted that 2022 has seen already 12 articles being published, although the data collection for this study occurred in April of this year.
4.2. Journal Performance
Table 4 depicts the source impact of the articles related to consumer behavior and sustainability in e-commerce. The journal indices (
h-index,
g-index,
m-index) were also calculated. The
h-index (Hirsh index) aims to quantify the journal’s impact and productivity using the number of articles and citations per publication as input [
53]. The
h-index is determined by the number of articles with a total number of citations greater than the total number of articles [
53]. For instance, in a journal with five published papers, if each paper has more than five citations, its
h-index is five. However, if a journal publishes thirty papers but only five papers have more than thirty citations, its h-index is also five. The
g-index measures the performance of the sources using the citation evolution over time [
54]. The
m-index uses the
h-index and the time the first article was published (
n). Hence,
m-index =
h-index/n [
55].
The source that contributed the most to consumer behavior and sustainability in e-commerce was by far the Sustainability scientific journal (34 articles). This journal also was the one with more citations (418). Sustainability, an MDPI journal, is an open-source journal related to the human beings’ environmental, cultural, economic, and social sustainability [
56]. After Sustainability, the journals that published the most articles related to the topic of consumer behavior and sustainability in e-commerce were the International Journal of Environmental Research and Public Health (four papers; two citations), Journal of Cleaner Production (four papers; 406 citations), and Journal of Retailing and Consumer Services (four papers; 92 citations). Sustainability had the highest number of citations (418), and the Journal of Cleaner Production had 406 citations; with only four papers published, the latter has achieved greater reach in terms of citations. These four papers form part of the ten most cited papers (see
Table 5), suggesting their high relevance to the topic. These were respectively focused on collaborative consumption [
28], carbon emissions and consumer free-riding behavior, where consumers take advantage of a traditional retailer’s services while making purchases from an e-tailer at a cheaper cost [
15]; peer-to-peer sharing [
32]; and environmental responsibility supply chain with green investment [
51].
The Scimago Journal Ranking (SJR) was also accessed to reveal the relevance of the journals where the papers were published. The criteria used for the selection was the highest quartile, regardless of the topic, an approach used by other studies (e.g., [
31]). It is interesting to acknowledge that the five most productive journals are first quartile journals based on the Scimago Journal Ranking (SJR) 2021 indicator, with an impact factor of 3.251, 3.390, 9.297, and 7.135, respectively, revealing the importance of the topic for academia. These four journals published 47.1% of the total articles and 64.1% of the total citations.
Consistent with the citation’s numbers, Sustainability had the highest h-index, g-index, and m-index, with 12, 19, and 0.923, respectively. These results reflect the superlative productivity regarding consumer behavior and sustainability in e-commerce.
Among the dataset and following the SJR indicator, 38.9% of the journals were ranked in the first quartile, 29.6% in the second quartile, 24.1% in the third quartile, and only one article was published in the fourth quartile. These results reinforce the importance of the topic for academia.
Figure 2 highlights growth of the Top 5 most productive journals from 2001 to 2021. It is possible to acknowledge Sustainability’s outstanding contribution to the topic. Moreover, it confirms the growing interest in the topic since 2013.
4.3. Overview of Influential Publications
Among the 104 articles, the average number of TC for each article was 13.8 (standard deviation = 25.9). The number of citations was used to determine the impact of the most influential articles in the dataset [
57]. The most cited article was the work by Piscicelli et al. [
28], with 198 citations, 24.75 citations per year (
Table 5). Recent articles are prominent in the list of the ten most cited articles, showing the recent interest of academia in the topic under study. Eight of the articles were published after 2015. The article with the highest average citations per year was the work of Tran [
58]. This work also had the highest Normalized Citation Impact (14.809). The Normalized Citation Impact compares the performance of an article with the average performance of the remaining articles [
59]. The article byTran [
58] was published in the Journal of Retailing and Consumer Services and created a methodical framework to investigate the impact of the perceived effectiveness of e-commerce platforms on economic gains in predicting sustainable consumption.
Table 5.
The top10 most cited articles.
Table 5.
The top10 most cited articles.
Article | Title | TC | Average TC per Year | Normalized TC |
---|
[28] | The role of values in collaborative consumption: insights from a product-service system for lending and borrowing in the UK | 198 | 24.750 | 1.960 |
[60] | The Relationship of E-Commerce Competence to Customer Value and Firm Performance: An Empirical Investigation | 89 | 4.944 | 1.000 |
[15] | Carbon emissions in a dual channel closed loop supply chain: the impact of consumer free riding behavior | 85 | 12.143 | 1.770 |
[58] | Managing the effectiveness of e-commerce platforms in a pandemic | 71 | 35.500 | 14.809 |
[32] | Consumer motives for peer-to-peer sharing | 71 | 14.200 | 2.038 |
[61] | Relationship between Convenience, Perceived Value, and Repurchase Intention in Online Shopping in Vietnam | 63 | 12.600 | 1.808 |
[62] | Limits to growth in the new economy: exploring the “get big fast” strategy in e-commerce | 53 | 2.650 | 1.000 |
[51] | Dual-channel structure choice of an environmental responsibility supply chain with green investment | 52 | 13.000 | 2.955 |
[63] | The influence of e-services on customer online purchasing behavior toward remanufactured products | 50 | 8.333 | 1.667 |
[10] | The Effects of Online Shopping Context Cues on Consumers’ Purchase Intention for Cross-Border E-Commerce Sustainability | 37 | 9.250 | 2.102 |
Piscicelli et al. [
28] explored how consumer values could affect whether collaborative consumption, and a new socioeconomic model based on sharing, renting, gifting, trading, exchanging, lending, and borrowing, was accepted, adopted, and diffused. Through a case study of Ecomodo, a UK-based online marketplace where people can lend and borrow each other’s possessions, spaces, and skills, it empirically examined the values and presented the findings of a quantitative study that used Schwartz’s Portrait Value Questionnaire to identify and quantify value priorities among Ecomodo users.
In order to develop a lasting competitive advantage in e-commerce, competency was presented by Saeed et al. [
60] as a critical factor in organizational performance, arguing that this effect is mediated by the creation of “customer value” through website functionality. The relationship between customer value, electronic commerce expertise, and both short- and long-term firm performance was investigated using empirical primary and secondary data from over 100 companies. The empirical results demonstrated that businesses with strong e-commerce capabilities performed better, and that this relationship was at least in part mediated by the value that customers derived from using websites. In addition, the findings also demonstrated how businesses could improve their short-term profitability by giving customers value prior to a purchase.
He et al. [
15] investigated the influence of government e-commerce taxes on carbon emissions as well as the effects of consumer free riding on the carbon emissions throughout the life cycle of a product in a dual channel closed loop supply chain. Consumer free riding occurs frequently when customers take advantage of a traditional retailer’s services while making cheaper purchases from an online retailer. The results revealed that although consumer free riding behavior may assist manufacturers economically, it also increases the overall carbon emissions throughout the supply chain. Government taxes on e-commerce can help to lower both consumer free riding and total carbon emissions. In order to maximize social welfare, this research also showed that the government could need to fund the online retailer.
Given the significant effects of the COVID-19 pandemic on business operations, Tran [
58] proposed a systematic approach to investigate the relationship between the consumers’ perceptions of the economic benefits of e-commerce platforms and sustainable consumption. The conceptual model used in this study was based on the uses and gratification theory with the border condition of pandemic fear included. This study revealed a positive moderating influence of pandemic fear on the interactions among the perceived effectiveness of e-commerce platforms, the economic advantages, and sustainable consumption.
Hawlitschek et al. [
32] created a theoretical model based on a wide range of potential consumer reasons to explore the relative weight of consumer motives for and against peer-to-peer sharing. The five most significant drivers and criteria for platform use intentions, according to this research, are financial incentives, trust in other users, a modern lifestyle, effort expectations, and ecological sustainability.
Pham et al. [
61] looked at the direct and indirect effects of the dimensions of online shopping convenience on the repurchase intention through customer-perceived value with the aim of giving online merchants numerous approaches to improve their online shopping service. According to the findings, access, search, assessment, transaction, and possession/post-purchase convenience are the five characteristics of online buying convenience. Perceived value and repurchase intention are directly impacted by all dimensions. The findings further highlight the critical significance of the perceived value in situations when a component both directly affects the repurchase intention and mediates the link between convenience and repurchase intention.
Oliva et al. [
62]’s formal dynamic model of competition between online and click-and-mortar enterprises in business-to-consumer e-commerce addressed the “get big fast” strategy used by e-businesses. Demand, market share, service quality, employee skill and retention, content development, market valuation, and other important variables were endogenously generated by the model. This study investigated the sustainability of expansion plans for e-commerce businesses under various scenarios for the consumer, competitor, and capital market behavior.
In order to explore the dual-channel structure strategy of a green company and further examine its environmental performance under fuzzy uncertainties, Yang et al. [
51] modeled the environmental responsibility behaviors of both the manufacturers and customers. The dual-channel structure approach with the consideration for behavioral features is produced by solving game models. While the high degree of environmental responsibility on the part of the manufacturer and the cost of going green are barriers, the degree of greenness and the uncertainties surrounding consumer demand have urged manufacturers to start their own online channel. Dual-channels might not be helpful in protecting the environment, despite increasing the green level. Furthermore, the store may profit from the implementation of a direct channel when the environmental costs are relatively modest.
Xu et al. [
63] investigated the effects of e-service offerings in four online transaction phases (i.e., information, agreement, fulfillment, and after-sales phase) on the customer purchasing intention toward remanufactured products in both auctions and fixed price transactions through an empirical study based on the new, manufacturer remanufactured, seller remanufactured, and used products transaction data from eBay. The findings showed that the customers’ willingness to pay (WTP) in both types of transactions was primarily influenced by e-service offerings made during the information phase. The results showed that e-services in all four online transaction phases significantly influenced the customers’ WTP in auctions, but not in fixed price transactions, indicating that e-services in auctions have a stronger positive influence on the consumers’ WTP than fixed price transactions. The findings also demonstrated that buyers were willing to pay more for seller-remanufactured goods than for used goods in both types of transactions, and even more for manufacturer-remanufactured goods and brand-new goods.
Finally, Xiao et al. [
10] analyzed the online shopping context that determines the consumers’ purchase intentions and pinpointed four cues including online promotion cues, content marketing cues, personalized recommendation cues, and social review cues, which support this consumption behavior in cross-border e-commerce. In order to analyze the impacts of these four cues and brand familiarity on the customers’ buy intentions in cross-border online shopping, the authors suggested a theoretical model based on cue usage theory and the stimulus-organism-response model. This article also looked at how the perceived emotional value and perceived functional value interacted. The findings revealed that these four cross-border online shopping context cues greatly increased the customers’ likelihood to make a purchase. The four cues and the perceived functional value were strongly negatively moderated by brand familiarity, which also had a negative influence on the relationships between the online promotion cues, social review cues, and perceived emotional value.
4.4. Authors’ Performance Analysis
Identifying the most contributing authors is relevant as they are essential in the field’s structure and growth [
64,
65] and positively influence the future of the research topic. Among the dataset, 342 different authors contributed to the field.
Table 6 highlights the most productive and cited authors, respectively, based on the number of articles published and citations. The most productive author was Rai HB., with four articles, and Macharis C., and Verlinde S., with three articles each. This same ranking applied to the number of citations. Rai HB. was the most cited in the list (59 citations), and Macharis C., and Verlinde S. had 57 citations each. This result is related to the fact that three papers were published in common [
52,
66,
67]. However, Rai HB. was the author with the highest fractionalized frequency (1.83). In the fractionalized frequency, each author receives a credit for each article, depending on the number of authors [
68]. For an article with only one author, the author receives one point. If an article has two authors, each author receives a half-point, and so on. This analysis allows an understanding of how academics interact with each other through co-authorship [
47,
69]. From the list, the author with the fewest points was Adreopoulou Z. Using the number of articles and fractionalized frequency, it is possible to conduct a Pearson correlation with the aim to understand the relationship between the total and adjusted appearances. The Pearson correlation result was 0.75, revealing a strong relationship between the total and adjusted appearances, suggesting that the most productive authors co-authored with a reduced number of authors and that a relatively small group of researchers was studying consumer behavior and sustainability in e-commerce. This result was confirmed by the works of Rai H.B., Macharis C., and Verlinde S., who had three papers that were developed together [
52,
66,
67].
Although Rai H.B., Macharis C., and Verlinde S. were the most productive authors, Cooper T., Fisher T., and Piscinelli L. were the most cited, with 198 citations each. This result was derived from the paper “
The role of values in collaborative consumption: Insights from a product-service system for lending and borrowing in the UK” [
28] published by these three authors.
4.5. Authors’ Keywords Analysis
Through the authors’ keywords, it was possible to identify the growth of the authors’ keywords by frequency between the years 2001 and 2022. One can acknowledge that the keyword “Electronic Commerce” has been a constant throughout the years, and its growth is enduring. Related to this keyword, “E-Commerce” has had outstanding growth since 2012. These results suggest a growing trend. Although the keyword “Sustainable Development” emerged in 2017, the keyword “Sustainability” stood out in 2018 and has seen an abrupt growth, suggesting a trend. In this context, the interest in “Consumer Behavior” has also seen steady interest since 2003. However, in 2018, the interest has grown immensely. Although the data collection occurred in the early months of 2022 (April), all of the keywords in
Figure 3 equaled or surpassed the numbers of the previous year (2021).
A complementary analysis was performed to acknowledge the most frequent keywords (
Figure 4). The authors used 441 different keywords. The most frequent keyword was E-Commerce, cited 29 times, followed by Consumer Behavior, cited 19 times, and Sustainability, with 11 citations.
Figure 5 highlights the author’s keyword co-occurrence network. This analysis reflects the literature’s relationship and conceptual map [
70] regarding consumer behavior and sustainability in e-commerce. Each color represents a cluster. The size of the keyword edge represents the frequency that such a keyword is mentioned. In turn, the thickness of the lines between the edges indicates the frequency of co-occurrence. The red cluster provides quantitative support and suggests the interconnection between e-commerce and, for instance, last-mile delivery. Last-mile delivery is pivotal in the environmental sustainability of city logistics in the e-commerce market [
71]. Changing the channel-shopping from the physical to online can reveal positive and negative effects on transport and environmental sustainability, depending on the last-mile delivery procedures [
37]. This is recognized as an emerging area of research [
26].
Figure 6 shows a thematic map based on the co-occurrence of the authors’ keywords. The thematic map uncovered the typological themes using co-word analysis. The results identified themes within the research topic [
72]. Therefore, the thematic map analysis highlights the specific research areas of interest in consumer behavior and sustainability in e-commerce, revealing clusters of linked terms. The selected criteria for analysis were the top 100 words and a minimum of five clusters.
Figure 6 also revealed 12 clusters, represented by different colors. The results suggest that a higher number of niches characterizes the topic of consumer behavior and sustainability in e-commerce. The cluster that dominated the topic was e-commerce (purple cluster). As expected, due to our research topic, e-commerce studies strongly related to consumer behavior, and sustainability such as the influence of the online shopping context on the consumer purchase intention within the realm of cross-border e-commerce sustainability [
10]. However, this analysis showed that this topic had a relationship to city logistics [
35], big data analytics [
73], customer engagement [
32], the circular economy [
33], online services [
74], and omnichannel retail [
52], showing the different research approaches and the transversal themes related to the topic. In fact, online retail has led to a new paradigm in terms of transactions in a transversal way [
66], and COVID-19 has made a significant contribution to this change [
75].
A thematic map analysis of themes (
Figure 7) revealed the e-commerce, consumer behavior, and sustainability at the center stage of the basic themes, but with each one emphasizing different foci. First, the e-commerce research showed major attention to online marketplaces [
76] as well as to online gamification mechanisms [
77]. Second, (online) consumer behavior studies looked at consumer perception, more specifically, the perceived risk and perceived value [
78], and customer loyalty [
79]. Third, sustainability considered sustainable development [
80], sustainable purchase behavior [
81], and sustainable consumption [
82].
The motor themes were not only related to e-commerce and e-business, but showed more specificities. On one hand, a consumer focus took place covering the consumer preference [
83], customer engagement and satisfaction [
84], and e-loyalty [
85]. On the other hand, two ranges of topics were also addressed, namely environmental sustainability [
13], and an operational one envisaging both logistics and last-mile delivery [
26].