To measure the impact of exclusivity in influencer marketing, you need to define your goals and metrics, and track and analyze them accordingly. Common metrics to measure the impact of exclusivity include reach and impressions, engagement and sentiment, conversions and sales, as well as loyalty and advocacy. Reach and impressions measure how many people saw your influencer's posts or content that featured your exclusive products or offers. Engagement and sentiment measure how many people interacted with your influencer's posts or content, such as likes, comments, shares, or reactions, and how they felt about them. Conversions and sales measure how many people took action or bought from you after seeing your influencer's posts or content. Finally, loyalty and advocacy measure how many people became loyal or repeat customers or advocates for your brand after seeing your influencer's posts or content.