单项选择题

Accounting profit is often an unsatisfactory performance measure from an economic point of view because it:（）

A. does not consider depreciation.
B. does not consider the opportunity costs of equity capital.
C. considers marginal costs rather than average costs.

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单项选择题Marko Tskitishvili, an economist, has been studying the drop in the price of the average household computer in the U.S. and wonders if computers should still be considered a luxury good or if it has now become a normal good. He conducts a survey of 500 people and finds the following: Assume that 1998 is the base date. Based on the above data, Tskitishvili would conclude that a computer is a:（）

A. luxury good with income elasticity of 1.01.
B. normal good with income elasticity of 0.84.
C. luxury good with income elasticity of 1.18.

单项选择题At a fixed level of capital, output increases as the quantity of labor increases, but at a decreasing rate. This phenomenon is an example of:（）

A. law of diminishing costs to labor.
B. law of diminishing returns to capital.
C. law of diminishing returns to labor.