Which consumer psychology principle was most directly responsible for driving the Guinness World Record for 'largest online shopping festival' set by China's Singles' Day?

The psychology behind consumer behavior has led to some fascinating world records in retail and marketing. Understanding what drives consumers to participate in record-breaking purchasing events reveals deep insights about human motivation, social influence, and the power of brand storytelling. Test your knowledge about the intersection of world records and consumer psychology with this challenging question!

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Scarcity principle - limited-time flash sales creating urgency
Social proof - celebrity endorsements driving mass participation
Reciprocity - free gifts with purchase increasing order values
Authority principle - government endorsement of national shopping event