Which psychological principle best explains why books endorsed by celebrity book clubs (like Oprah's Book Club or Reese's Book Club) typically see a massive surge in sales?

The publishing industry has long studied consumer psychology to understand what makes readers pick up certain books while ignoring others. From cover design to book placement, publishers employ numerous psychological tactics to attract readers. This poll tests your knowledge about how consumer psychology influences book purchasing decisions in the literary marketplace.

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Social proof - consumers trust recommendations from figures they admire and believe that popular choices must be good choices
Scarcity principle - readers believe these endorsed books will become limited editions and therefore more valuable
Mere-exposure effect - repeated visibility of book covers in media creates automatic preference
Anchoring bias - higher perceived value due to association with wealthy celebrities justifies book purchase price