ps8 - ) = x y where , > 0. (a) Show that f is...

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Atsushi Inoue ECG 765: Mathematical Methods for Economics Fall 2009 Problem Set ] 8 Due in class on Tuesday, October 27 1. Check whether each of the following functions is concave, convex, strictly concave, strictly convex, or neither. (a) f ( x ) = log( x ) on < ++ . (b) f ( x ) = exp( x ) on < . (c) f ( x ) = sin( x ) on < . (d) f ( x ) = x 5 on < ++ . (4 points) 2. Define f : < 2 ++ → < by f ( x,y
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Unformatted text preview: ) = x y where , &gt; 0. (a) Show that f is concave if + 1. (2 points) (b) Show that f is quasi-concave, but not concave, if + &gt; 1. (2 points) 3. Read pages 407409 of Simon and Blume (1994) and do exercise 17.9 of Simon and Blume (1994, p.410). (2 points) 1...
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