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Past costs should not own future choices

A sunk cost is time or money already spent that cannot be recovered.

The idea

Rational decisions compare future benefits with future costs. Past effort feels important emotionally, but it does not improve a bad option going forward.

An example

Finishing a poor course only because you paid for it can waste ten more hours. The payment is gone either way; the ten hours are still yours to protect.

Put it into practice

Ask: “If I had not already invested in this, would I choose it today?”