Impact of Social Media Macro-Influencer Authenticity on Purchase Intention for Fast Food Brands in Sri Lanka Among Gen Z: The Mediating Effect of Brand Credibility

Abstract

This research explores the impact of social media macro-influencer authenticity on purchase intention for fast food brands in Sri Lanka among Gen Z: the mediating effect of brand credibility. This demographic, characterized by its digital savviness and preference for authenticity, presents unique challenges and opportunities for marketers. The study addresses a critical gap in literature by investigating how key factors of influencer authenticity trustworthiness, expertise, attractiveness, and similarity shape purchase intentions. It also examines the role of brand credibility in this dynamic. Fast-food brands face significant competition and need innovative marketing strategies, particularly in urban regions where consumer preferences are rapidly evolving. The research situates itself within the existing literature on influencer marketing and extends it by contextualizing findings within the socio-cultural and economic environment of Sri Lanka, providing actionable insights for brands seeking to optimize their marketing strategies for Generation Z. and 403 members of Generation Z who actively follow fast-food influencers on social media sites like Facebook, Instagram, and TikTok were given a structured online survey as part of the study's quantitative research approach. Statistical methods such as the Cronbach's alpha, KMO, and Bartlett tests were used to make sure the data was reliable and valid. Regression analysis and mediation analysis were used in the data analysis to ascertain the direct influence of influencer authenticity characteristics on purchase intention and the involvement of brand credibility in this connection, respectively. The Source Credibility Model serves as the theoretical foundation for the study, highlighting the crucial role that influencers' perceived sincerity plays in influencing customer behavior. Additionally, the analysis takes demographic and cultural factors into account, placing the results in the larger framework of digital marketing.

The results show that purchase intention is significantly positively impacted by macro-influencer authenticity, with likeness and beauty being the most important characteristics, followed by knowledge and trustworthiness. This relationship is further amplified by the mediating function of brand credibility, which shows that real influencers not only directly affect customer choices but also raise the perceived legitimacy of the companies they support. These findings are consistent with earlier studies that highlight the value of relevant and trustworthy influencers in building engagement and trust, especially among Generation Z. The Western Province was the study's primary emphasis, which restricts the findings' applicability to other parts of Sri Lanka where cultural and economic circumstances can be different. Furthermore, using self-reported information gathered via online questionnaires raises the possibility of response biases. Future research could address these. By using a variety of geographic samples, performing in-person or offline interviews, and investigating the joint roles of macro and micro-influencers, future study could overcome these constraints. This study has both theoretical and practical ramifications. The study theoretically adds to the expanding corpus of research on influencer marketing by emphasizing the relationship between customer behavior, brand credibility, and influencer authenticity. By placing the Source Credibility Model in the context of an emerging economy's digital marketing environment, it expands upon it. In practice, the results give fast-food companies a foundation for improving marketing efficacy. Businesses can increase trust and create stronger bonds with their target audience by collaborating with influencers who exhibit authenticity and share brand values. The study emphasizes how crucial it is to incorporate culturally appropriate and open marketing techniques, making use of the special qualities of macro influencers to successfully interact with Generation Z. For marketers navigating Sri Lanka's fiercely competitive and technologically advanced fast-food business, these insights are priceless.