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Question 3 (20 marks) (a) Suppose that A and B represent two inputs into a firms production function. The firms production function is given by F(A, B) 2A3B. Let wA and wB denote the prices of inputs A and B, respectively. Under what conditions will a profit-maximizing firm choose to use a positive amount of A? (7 marks) (b) Suppose a firm has cost function: C(Q) 200+3Q1/2Q2. The lowest price at which this firm will produce a positive output in the short term is? (7 marks) (c) Consider a perfectly competitive market where demand is very inelastic relative to sup- ply. How will an upward shift in the supply curve affect the price and quantity? Compare the changes in the price and quantity. (6 marks)

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Answer #1

The marginal product of capital (MPK) function is the partial derivative with respect to capital. That is, MPK=(25/3)(L/K)^(2/3). Likewise, the marginal product of labor (MPL) function is the first derivative with respect to labor. That is, MPL=(50/3)*(K/L)^(1/3).

Since the exponents on capital and labor sum to one, this production function displays constant returns to scale.

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