…The sunk cost fallacy is a cognitive bias that makes you feel as if you should continue pouring money, time, or effort into a situation since you’ve already “sunk” so much into it already. This perceived sunk cost makes it difficult to walk away from the situation since you don’t want to see your resources wasted.

For example, have you ever stuck with something because you’ve already put in so much effort? Like reading a terrible book because you’re already halfway through, so you might as well find out what happens.

When falling prey to the sunk cost fallacy, “the impact of loss feels worse than the prospect of gain, so we keep making decisions based on past costs instead of future costs and benefits,” explains Yalda Safai, MD, MPH, a psychiatrist in New York City.

According to the National Institutes of Health (NIH), this leads to irrational, emotion-based decision-making, causing you to spend additional resources on a dead end instead of walking away from the situation that’s no longer serving you.1