We are hardly rational about sunk costs; traders hold “paper losses” while entrepreneurs let incurred costs affect their current decision making. In reality, paper losses are as real as actual losses; however, traders hang on to losing positions hoping that it will somehow turnaround and their paper losses would magically disappear. This is as good as a gambler, on losing once, bets bigger and bigger stakes in hope of covering his losses.
Entrepreneurs, on the other hand, often let imprudent investment decisions come back to haunt them. It could be a failed marketing plan, it could be a failed merger decision, or it could be a failed hire. Instead of moving on and learning from their mistake, entrepreneurs try to salvage the losses, and end up sinking in more resources when they could be channeling the resources to more productive use.
Sunk cost would be better termed as lost cost.





