Endowment Effect

Ownership doesn't just change your legal relationship to an object — it changes your psychological relationship to losing it. The pain of giving up something you have is roughly twice as intense as the pleasure of gaining something equivalent, which means the mere act of possession warps your sense of what things are worth. This isn't just about coffee mugs in experiments — it explains why companies offer free trials, why bad relationships persist, and why organizations can't kill failing projects.

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