Market demand is given as Q_D= 200 - P.Market supply is given as Q_S= 4P + 100.Each identical firm has MC = 4Q and ATC = 2Q.What is a firm's average total cost

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The firm's average total cost (ATC) is given as ATC = 2Q. To find the ATC, we need to determine the quantity (Q) at which the firm operates. In a perfectly competitive market, firms produce where P = MC. Given MC = 4Q, we equate it to the market price P. Solving the market equilibrium where QD = QS, we find P = 20 and Q = 5. Substituting Q = 5 into ATC = 2Q gives ATC = 10.

Market Demand Is Given as QD = 200 - P

Market Demand Is Given as Q_D= 200 - P