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18. What two rules does a perfectly competitive firm apply to determine its profit-maximizing quantity of output? I thonoint
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The two rules that perfectly competitive uses in order to determine profit-maximizing price and output are:

Rule 1; Price must be equal to Marginal Cost i.e. P = MC.

Rule 2; Profit maximizing output must be chosen at that point where marginal cost is equal to marginal cost i.e. MR =MC.  

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