Sunk-cost bias is the tendency to continue to invest time, money, or energy into something we know is a losing proposition simply because we have already incurred, or sunk, a cost that cannot be recouped. But of course this can easily become a vicious cycle: the more we invest, the more determined we become to see it through and see our investment pay off. The more we invest in something, the harder it is to let go.
The sunk cost bias
