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The general rule is that the firm maximizes profit by producing that quantity of output where marginal revenue equals marginal cost. The profit maximization issue can also be approached from the input side. That is, what is the profit maximizing usage of the variable input?
Mathematically, the markup rule can be derived for a firm with price-setting power by maximizing the following expression for profit: = () where Q = quantity sold, P(Q) = inverse demand function, and thereby the price at which Q can be sold given the existing demand C(Q) = total cost of producing Q.
C. Robert Taylor points out that the accuracy of Hotelling's lemma is dependent on the firm maximizing profits, meaning that it is producing profit maximizing output and cost minimizing input . If a firm is not producing at these optima, then Hotelling's lemma would not hold. [2]
The profit maximization issue can also be approached from the input side. That is, what is the profit maximizing usage of the variable input? To maximize profits the firm should increase usage "up to the point where the input’s marginal revenue product equals its marginal costs". So, mathematically the profit maximizing rule is MRP L = MC L. [10]
Hotelling's rule defines the net price path as a function of time while maximizing economic rent in the time of fully extracting a non-renewable natural resource.The maximum rent is also known as Hotelling rent or scarcity rent and is the maximum rent that could be obtained while emptying the stock resource.
The mathematical profit maximization conditions ("first order conditions") ensure the price elasticity of demand must be less than negative one, [2] [7] since no rational firm that attempts to maximize its profit would incur additional cost (a positive marginal cost) in order to reduce revenue (when MR < 0). [1]
Notice that at the profit-maximizing quantity where =, we must have = which is why we set the above equations equal to zero. Now that we have two equations describing the states at which each firm is producing at the profit-maximizing quantity, we can simply solve this system of equations to obtain each firm's optimal level of output, q 1 , q 2 ...
Profit maximization condition Pricing power Perfect competition: Infinite None Perfectly elastic None Short term yes, long term no Yes [16] P=MR=MC [17] Price taker [17] Monopolistic competition Many Low Highly elastic (long run) [18] High [19] Short term yes, long term no [20] No [21] MR=MC [17] Price setter [17] Monopoly: One High Relatively ...