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The Danger of Sunk-Cost Thinking

What you have already spent should not decide what you do next, yet it constantly does.

One of the most reliable errors in human judgment is letting what we have already spent, in money, time, or effort, decide what we do next. Economists call it the sunk-cost fallacy: money and time already gone are gone, and rationally should not influence a forward-looking decision. Yet they constantly do, keeping people trapped in things they should leave.

Why the past traps us

Having invested heavily in something, a project, a relationship, a strategy, we feel that abandoning it wastes the investment, so we keep going to justify what we have already put in. But the investment is already spent whether we continue or not; continuing only adds more cost to a losing situation. The right question is never how much have I already put in, but what is the best decision from here, forward. The past is not recoverable; it should not be a vote.

Where it does damage

Sunk-cost thinking keeps failing projects alive long past the point of sense, because so much has been spent that stopping feels like admitting waste. It keeps people in careers, ventures, and commitments that no longer serve them, throwing good time after bad. The larger the prior investment, the stronger the pull, which is why the biggest, most sunk commitments are often the hardest to abandon even when they clearly should be.

Escaping it

The discipline is to evaluate decisions only on their future costs and benefits, deliberately ignoring what is already sunk. A useful test: if I were deciding fresh today, with no history here, would I start this? If the answer is no, the prior investment is the only thing keeping you in, and it is the wrong reason. Letting go of sunk costs is painful and freeing, and it is what allows resources to flow to where they will actually do good.

Decide from here forward. What is gone is gone.

Published by Greenridge Media. Views expressed are the author's own.

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