答案如下 
The opportunity cost of a firm's equity capital is:  A) an historical cost. B) a fixed cost. C) an implicit cost. D) an explicit cost. 
 Your answer: C was correct!  The opportunity of using a firm's equity capital is an implicit cost. It is an implicit cost because it does not appear on the firm抯 income statement or balance sheet. Another implicit cost is owner-provided services. 
 
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