sunk cost(redirected from Bygones principle)
Also found in: Medical.
Money that has already been spent. Sunk costs are important because a company may use, for example, an old piece of equipment to make a new product. In this case, sunk costs are positive because no further investment is required. On the other hand, a sunk cost may be negative; for example, that old piece of equipment may break down after its warranty has expired. This means that the owner will not recover the costs no matter what happens.
A past outlay or loss that cannot be altered by current or future actions.