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MC 90 80 70 ATC 60 MR 50 40 30 20 10 30 47 60 75 90 105 120 The figure shows MC, MR and ATC curves for Joe's Good Enough Cafeteria, a firm that operates in a competitive market. If the firm is producing 75 units of output, increasing output by one unit would the firm's profit by If the firm is producing 105 units of output, increasing output by one unit would the firm's profit by $ Joe's SHORT RUN equilibrium quantity is equal to and profit is $