Decision-Making Biases
Sunk cost fallacy
Continuing because of what has already been invested.
What Is Sunk cost fallacy?
Sunk cost fallacy is a thinking trap where continuing because of what has already been invested.
How It Tricks You
It can make one option feel obvious before the tradeoffs have been checked.
Real-World Example
Someone finishes a bad movie because they already paid for the ticket.
Seen Online As
- I have already put too much into this to stop now.
- Quitting would mean all that effort was wasted.
- We might as well keep going because we are already deep in it.
What To Ask Instead
What would I do if I were starting today?
Related Thinking Traps
Common Situations
Quick FAQ
What is Sunk cost fallacy?
Continuing because of what has already been invested.
What is an example of Sunk cost fallacy?
Someone finishes a bad movie because they already paid for the ticket.
How do I spot Sunk cost fallacy?
What would I do if I were starting today?