Which psychological principle best explains why celebrity product endorsements are typically more effective than endorsements from non-celebrities?

Celebrity endorsements have been a cornerstone of product marketing for decades, significantly influencing consumer purchasing decisions. From sports stars to actors, musicians to influencers, famous faces have helped brands increase visibility and credibility. This trivia question explores an interesting psychological phenomenon behind the effectiveness of celebrity product endorsements.

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The halo effect - positive feelings about a celebrity transfer to the products they endorse
The scarcity principle - products endorsed by celebrities seem more exclusive and therefore more desirable
The mere exposure effect - seeing celebrities repeatedly makes consumers more comfortable with their endorsed products
Social proof - consumers assume celebrities must have thoroughly tested products before endorsing them