Which consumer psychology principle explains why book retailers frequently place 'staff picks' or 'award winner' stickers on book covers?

Literary success isn't just about good writing—it's also about understanding consumer psychology. Publishers and bookstores use sophisticated analytics to predict which books will fly off shelves. This trivia question explores a fascinating psychological technique used in modern book marketing that has significantly impacted bestseller lists and reading habits in the digital age.

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Social proof - people are more likely to purchase books that others have validated
Scarcity principle - suggesting the book might be hard to find elsewhere
Price anchoring - creating a perception of value regardless of actual price
The IKEA effect - readers value books more if they've invested time selecting them