To measure a firms economic performance and position in a given period, it makes sense to measure all of the following except:

	A.	The daily free cash flow published by the Wall Street Journal.
	B.	Expenses incurred for resources consumed in that period.
	C.	A portion of the long-lived resources consumed during that period.
	D.	The cost of commitments made during that period to pay retirement benefits to employees in future periods.