Which psychological principle is MOST commonly leveraged by game developers to drive microtransaction purchases in free-to-play games?

Microtransactions have become a cornerstone of revenue for many gaming companies, generating billions in annual income. The psychological principles behind these small purchases are fascinating and carefully engineered. This poll tests your knowledge about the consumer psychology tactics used by game developers to encourage in-game spending. Do you know which psychological principle is most effective in driving player purchases?

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Loss aversion (fear of missing limited-time offers)
Cognitive dissonance (reconciling the gap between playing for free and spending money)
Social proof (seeing other players with premium items)
Operant conditioning (variable reward schedules in loot boxes)