This document discusses the important role that brand plays in conversion rate optimization (CRO). It notes that brand represents the promised experience based on how a product or service is mentally represented. It then provides examples showing how strong brands like Amazon Prime create loyalty that reduces cross-shopping between retailers. The document argues that brand has a nonlinear impact on value and revenue, and that CRO efforts should not hurt the brand's promise of experience. It aims to convince readers that optimizing both brand and CRO can have the greatest impact on acquiring and retaining customers.