Which psychological principle do game developers most commonly exploit to drive microtransactions in free-to-play games?

Modern gaming has evolved from a simple pay-once model to complex monetization strategies. One of the most controversial yet profitable techniques is microtransactions - small purchases that enhance gameplay or customize appearance. This poll explores the psychological principle that game developers most commonly leverage to drive microtransaction purchases in free-to-play games. Test your knowledge about the consumer psychology tactics that have transformed gaming economics!

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Loss aversion (fear of missing limited-time offers)
The endowed progress effect (feeling invested in progression)
Variable ratio reinforcement (unpredictable rewards that keep players engaged)
Social proof (showing purchases made by other players)