Sunk Cost Fallacy
The tendency to continue an endeavor once an investment in money, effort, or time has been made, even when the current costs outweigh the benefits. The prior investment (the “sunk cost”) cannot be recovered and should not influence future decisions.
Examples
- Finishing a bad book because you’ve already read half of it
- Continuing to invest in a failing project because of the resources already spent
- Staying in a bad relationship because of the years already invested
Why It Happens
Loss aversion makes abandoning a prior investment feel like admitting a mistake. The emotional pain of “wasting” what was already spent overrides rational forward-looking analysis.
How to Counteract
- Ask “If I were starting fresh today, would I choose this?”
- Recognize that sunk costs are gone regardless of what you do next
- Make decisions based on future costs and benefits, not past ones