The circular economy has become a topic of increasing relevance in the scientific field, and the literature on it has developed considerably in recent years. Therefore, a review is needed to contribute to the understanding of this term, which is under constant debate. This article aims to analyze scientific articles from qualitative and quantitative research approaches on the circular economy. The methodology used was a systematic review of scientific literature from Scopus and Web of Science; 67 scientific articles were systematized under inclusion and exclusion criteria related to the specific objectives sought. The results showed that there is still a long way to go in developing a theoretical framework that can be put into practice due to the divergence of existing perspectives or approaches, although its application to different fields of study is being considered. Likewise, its complex character is highlighted, while driving or limiting factors are observed. This research provides a theoretical contribution aimed at elucidating which implications of the circular economy need to be addressed in order to build a universal or flexible theory to understand what it means to plan for the implementation of the circular economy. In this way, it hopes to strengthen its practical application, which implies the need to create an overarching framework that can be adapted to different contexts and provide clear guidance on how to be part of the circular economy.

Sustainable consumption is a key concept in society and the environment due to its direct relationship with sustainable development; its importance lies in the decoupling of consumption and economic growth with environmental damage and its involvement with various behavioral disciplines and ecological concepts. Therefore, this research aims to analyze scientific articles linked to key perspectives of the concept under discussion. Due to the scope of the objective of systematizing the existing scientific literature on sustainable consumption in Scopus and Web of Science, a systematic review was carried out, including 104 scientific articles considering criteria that respond to the questions posed. It is concluded that sustainable consumption is a complex and nebulous concept whose theoretical fragmentation gives it breadth but generates overlapping concepts. Likewise, the link between the consumer and the circular economy and the difficulties behind such interaction was denoted. The complexity of being a green consumer in current times and the aspects that comprise it were also covered, and the importance, role, and tools of the government in sustainable consumption. Thus, it is expected to generate a consistent theoretical framework facilitating the creation of new applied research, considering the perspectives highlighted through this analysis.

Digital transformation has become a notorious topic in the financial sector, as its implementation brings about a positive change in the user experience. Its relevance is seen in how scientists study it from different points of view, while it attracts the interest of financial institutions, as the understanding resulting from the research can improve the implementation of plans in the new digital era. Therefore, the objective of this study is to determine the impact of digital transformation on consumer behaviour in the financial sector. A quantitative explanatory level approach was used. The study population was finite, consisting of bank customers, considering a simple random probability sample of 385. The technique used was the survey and a questionnaire as a validated and reliable instrument. Digital transformation has been shown to have a significant impact on consumer behaviour in the financial sector, tested by Chi-square and ordinal logistic regression (χ2 = 0.000 < 0.05; Wald coefficient = 29.162 = 0.000; Nagelkerke’s R2 = 0.381), confirming that consumer behaviour is driven by digitisation activities. This work highlights the importance of managing digital transformation as a mediator of business success and, within action plans, taking steps to improve customer service as a precursor to customer loyalty.