Sunk Cost Fallacy
Cognitive Bias入门
Definition
Continuing to invest time, money, or effort in something even when it's clearly not worthwhile, simply because of what has already been invested.
Example
"The movie is terrible, but I already spent 50 yuan on the ticket, so I might as well finish watching it."
如何避免
做决定时只考虑未来的成本和收益，已经花掉的钱或时间不应该影响当前的选择。