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Consider a firm in a competitive market. Given that its total cost function c(q) is increasing and smooth (first and second derivatives are continuous) with

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Consider a firm in a competitive market. Given that its total cost function c(q) is increasing and smooth (first and second derivatives are continuous) with c(0) = 0, and MC function is first decreasing and then increasing in q. (1) Show that the point where MC and AC cross with each other can only lie on the upward-sloping part of the MC curve. (Hint: Mean value theorem says, for any differentiable function f(a ) on a closed interval [a, b], there exists a point c E (a, b) such that f'(c) = [f(b) - f(a)]/(b - a). Use this theorem twice)

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