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We can generally demonstrate a relationship between scale elasticity and the slope of the average cost curve. Here, well demonstrate the result for only one input. Consider a (continuously differentiable and strictly increasing) production function F(L), where L denotes labor. 4. (a) Letting w denote the wage rate for labor, we can note that the cost function is C = WL, where L is the amount of labor necessary to produce q units of output, i.e.so that q F(L). dc dwl What is the derivative of cost with respect to labor, ie. what is a (b) Noting that q F(L), we can define MPL F(L) as the marginal product of labor. Demonstrate that: dC w da MPL Hint: Look at slide 10 of lecture 2, and apply the result from part (a). AC (c) Show that me- Escaie, where Escaie denotes the scale elasticity (d) Why can we conclude that a scale elasticity greater (less than) one will cause average cost to decrease (resp. increase)?

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dl o doi vatve wge bale OL P ICL) MPL Ac me MC

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