Which psychological principle best explains why consumers are more likely to purchase products endorsed by celebrities they admire?

Celebrity endorsements have become a cornerstone of modern marketing strategy. When famous people partner with brands, they bring their personal appeal and influence to help shape consumer perceptions. This phenomenon leverages consumer psychology in fascinating ways - we often develop parasocial relationships with celebrities that transfer positive associations to the products they promote. How well do you understand the psychological mechanisms behind celebrity endorsements and their impact on brand loyalty and consumer behavior?

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The Halo Effect - positive feelings toward a celebrity transfer to the products they endorse
The Primacy Effect - consumers remember the first celebrity endorsement they see for a product category
The Scarcity Principle - products seem more valuable when associated with exclusive celebrity status
The Contrast Principle - celebrities highlight the differences between competing products