A Study Of Effectiveness Of Influencer Marketing

Authors: Mohamed Vasim. A, Dr. S. Harshini

Abstract: Pick up your phone and open Instagram or YouTube. Within about fifteen seconds, someone you follow will be telling you about a product — not through a slick ad, but in a way that feels like a recommendation from someone you actually know. That is influencer marketing. It is a commercial message wearing the clothes of a personal recommendation, and it has become both one of the most talked-about and one of the most misunderstood channels in digital marketing. The real question is not whether brands are spending money here — they obviously are — but whether any of it is actually working, and why some of it works so much better than the rest. This study surveyed 150 respondents across demographic segments to examine how influencer marketing affects consumer purchase intent. It investigates influencer tier effects, content format preferences, perceived authenticity, and the role of product category in moderating influencer effectiveness. Simple percentage analysis and cross-tabulation were used to produce findings accessible to practitioners and students alike. What came back is this: micro-influencers — the ones with 10K to 100K followers — drive the highest purchase conversion at 38%, ahead of macro-influencers at 27%. Perceived authenticity of the endorser accounts for 64% of respondents' stated willingness to act on a recommendation. Short- form video content (Instagram Reels, YouTube Shorts) significantly outperforms static image posts across all age groups. Crucially, the effectiveness of influencer marketing varies substantially by product category: personal care and fashion show markedly higher conversion rates than electronics or financial services, where credibility requirements are more demanding. That has real consequences for how brands should be choosing who to work with and where to spend their money.