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Consumer Utility Maximization Calculus

Sun 26 Jun, 2016 07:44 am
Hey guys, Im currently struggling with this HW question. I was really confused by the condition that f '(x) > 0 for all x > 0, since I thought I need to set f '(..) to zero for maximizing the utility function.

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Calculate the consumer's system of demand funcations D1(P1, P2, I) and D2(P1, P2, I) if the consumer's utility functions is defined by:

U(X1, X2) = f [X1^(1/2) * X2^(1/2)]

where f is a continuously differentiable function of one variable which has f '(x) > 0 for all x > 0.
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Thank you very much in advance!
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Kolyo

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Sun 26 Jun, 2016 09:01 am
@Paraodx,
They are telling you that f(x) is strictly increasing,
which means you maximize f(expression) by maximizing the expression inside the f ().
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