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s Lemma The Cost Function: Five things to remember The Firm Production Cost minimisation Profit maximisation Optimisation Comparative Statics The Firm and the Market Two stages of optimisation Q Q decreasing returns to scale increasing returns to scale C/Q Shape of AC depends on RTS average cost and output... Q Q P C/Q CQ P cuts average cost at its minimum marginal cost P Q PQ Revenue P Q C/Q Revenue and Costs C/Q profits vary with Q ... Q Q Q Q Q Q Q P CQ P Maximum Profits price = marginal cost What condition holds at exactly this point?? P C/Q CQ price marginal cost P Q Q* = 0 What happens if price is low... Firstorder conditions if Q* 0: Price equals marginal cost Price covers average cost P = CQ (w, Q*) P ? C(w, Q*) Q* ______ covers both the cases: Q*0 and Q*=0 ... and in general: PQ* ? C(w, Q*) ? To Finish this Lecture ? Again check the “Quickie” example ?You’ve got enough now to do the first class assignment. Start today. ?Review the key concepts ?Profit maximisation can be viewed in two stages ?Stage 1: choose inputs to minimise cost ?Stage 2: choose output to maximise prof