Chang Industries has 1500 defective units of product that already cost $44 each to produce. A salvage company will purchase the defective units as is for $20 each. Chang's production manager reports that the defects can be corrected for $36 per unit, enabling them to be sold at their regular market price of $36. The $44 per unit is a:

		Incremental cost.
		Sunk cost.
		Period cost.
		Out-of-pocket cost.
		Opportunity cost.

.