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4. Suppose a firm uses only one input (L) to produce output y, with the production function y L Suppose the firm sells its output in a competitive market at price p, and buys labor in a competitive market at price w. a. Write an expression for the profits of the firm as a function of w, p, and L. b. What is the marginal cost of hiring an additional unit of labor? Graph the marginal cost of labor curve c. What is the marginal revenue from hiring an additional unit of labor? Graph the marginal revenue curve on the same graph as in part b. d. Assume the firm maximizes profits. How much labor should it hire as a function of the real wage w/p? Find the solution for L, and also display it on the graph. e. Does the firm hire more or less labor as p increases? Why?

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