The Sunk Cost Effect
We stick with something simply because we've already poured time, money, or emotion into it.
The sunk cost effect describes the tendency to let already spent resources influence future decisions, even though rationally they shouldn't. A sunk cost cannot be recovered; the question should always be what pays off moving forward from now. In practice, people and organizations find it hard to 'let go' of what they've invested in, continuing with projects, relationships, or purchases long after they should have walked away.
You are two hours into a bad movie. Wasting those hours feels worse than wasting another hour—so you stay. But the cost of having sat there is already paid, regardless of what you do now.
The effect is strongest when the decision is tied to identity, prestige, or a public promise. That's why politicians and companies sometimes persist with clearly doomed ventures.
Leaving a project isn't admitting that the time was wasted—it was lost either way. Staying, however, is an active choice that costs even more.
Think about something you continue doing mainly out of old habit. What would you choose today if you were starting from scratch?
Sunk costs shouldn't influence future decisions—yet they almost always do.
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