Sunk Cost Fallacy
Past costs shouldn't determine future decisions.
Evidence: established. We label every concept honestly, and say so when it's a teaching model. How we rate evidence.
Shrink Definition
The sunk cost fallacy is the tendency to continue investing time, effort, money, or emotional energy into a decision simply because significant resources have already been invested, even when future evidence suggests a different course of action would be more beneficial. Past investments are "sunk" because they can't be recovered. Good decisions should be based primarily on future consequences rather than irretrievable past costs.
Plain language
Don't let yesterday's investment force tomorrow's mistake.
Shrink Insight
The more we invest, the harder it becomes to walk away, even when walking away is wise.
Why it matters
The sunk cost fallacy affects: • careers • relationships • business • investing • education • healthcare • personal goals Remaining committed solely because of previous investment may prevent healthier future choices.
Common misunderstanding
Quitting isn't always failure. Sometimes quitting reflects accurate adaptation.
Shrink Perspective
Your next decision deserves to serve your future, not justify your past.
Shrink Reflection
Where are you continuing simply because you've already invested so much?
Shrink Journal
Complete: "If I were making this decision today for the first time..." Would you choose the same path?
Shrink Step
Separate your past investment from today's decision. Evaluate only the future.
Shrink Minute
History deserves respect. Not control.
Shrink Takeaway
Honor the lesson. Not the sunk cost.
Medical boundary
This concept is educational and shouldn't be used to self-diagnose. It doesn't replace care from a licensed clinician. Symptoms, medication, and treatment decisions should be discussed with a qualified professional, and emergency symptoms require emergency care.
Evidence summary
The sunk cost fallacy has been widely documented in behavioral economics, organizational psychology, and decision science. Research demonstrates that people often irrationally persist with commitments because of prior investments rather than expected future value.
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