The problem is trying to determine which cases are which. If you don't know there is nothing you can do. But the situations where teaching sunk cost can help i

The problem is trying to determine which cases are which. If you don't know there is nothing you can do. But the situations where teaching sunk cost can help is is when you DO know, but emotionally don't want to let go. Like when you your business is lost, and shouldn't put any more money in, but emotionally are clinging to the "I've spent so much time and effort and savings on this, I can't just walk away".