? Natural barriers to entry create a natural monopoly: an industry in which economies of scale enable one firm to supply the entire market at the lowest possible cost. So why "A" was not correct?? ofcourse I admit that the LRAC(the long-run average cost curve)decreases as output increases. But it doesn't mean that the ATC will continually decreases. | 
发表于 2008-6-23 23:21
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