The deficiencies of the existing approaches to measuring efficiency should dictate the minimum requirements that a new concept of relative economic efficiency should meet if it is to be at all useful. It should account for firms that produce different quantities of output from a given set of measured inputs of production. This is the component of differences intechnical efficiency.It should take into account that different firms succeed to varying degrees in maximizing profits, i.e., in equating the value of the marginal product of each variable factor of production to its price. This is the component of price efficiency. (iii) The test should take into account that firms operate at different sets of market prices. The decision rule on profit maximization yields actual profits (as well as quantity of output supplied and
quantities of variable inputs demanded) asa function, inter alia, of input prices. It is clear that two firms of equal technical efficiency which have successfully maximized profits would still have different value of profits as long as they face different prices
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