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Unformatted text preview: T. Mitra, Fall, 2008 Economics 6170 Problem Set 10 [For practice only; do not hand in solutions] 1. [Using KuhnTucker Sufficiency Theory by Contracting the Domain] Let p be an arbitrary positive real number. Consider the following con strained optimization problem: Maximize x . 5 1 + x . 5 2 subject to px 1 + x 2 px 3 + x 4 ( x 3 ) 2 + ( x 4 ) 2 1 ( x 1 ,x 2 ,x 3 ,x 4 ) R 4 + ( R ) (a) To solve problem ( R ) , first solve problem ( S ) given below: Maximize x . 5 1 + x . 5 2 subject to px 1 + x 2 px 3 + x 4 ( x 3 ) 2 + ( x 4 ) 2 1 ( x 1 ,x 2 ,x 3 ,x 4 ) R 4 ++ ( S ) Define X = R 4 ++ , f ( x ) = x . 5 1 + x . 5 2 , g 1 ( x ) = px 3 + x 4 px 1 x 2 , g 2 ( x ) = 1 [( x 3 ) 2 + ( x 4 ) 2 ] , where x = ( x 1 ,x 2 ,x 3 ,x 4 ) X. Write down and solve the KuhnTucker conditions for problem ( S ) , and denote the solution of the KuhnTucker conditions by ( x, ) X R 2 + . (b) Show that x solves problem ( S ) , and ( x, ) satisfies: f ( x ) + g ( x ) f ( x ) + g ( x ) for all x X (c) Use (b) and the continuity of f , g 1 and g 2 on R 4 + to establish that x solves ( R...
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 Fall '08
 MITRA

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