Which psychological principle do game developers most commonly leverage when designing 'limited-time' cosmetic skins or items in games like Fortnite or League of Legends?

In the modern gaming industry, microtransactions have become a controversial yet highly profitable business model. Publishers and developers carefully craft these in-game purchases using specific psychological principles to maximize player spending. This poll tests your knowledge about the consumer psychology techniques employed in gaming microtransactions that have revolutionized how games monetize their player base.

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Loss aversion - the fear of missing out on items that may never return
The endowment effect - players valuing items more once they imagine owning them
Operant conditioning - random reward schedules creating addiction patterns
Social proof - seeing other players with rare items increases perceived value