Unformatted text preview: if the sign of the first derivative is yes. a) f(u) = 3.141592 u YES since df/du = 3.14159 > 0 b) f(u) = 5,000 – 23 u NO since df/du = 23 < 0 c) f(u) = u – 100,000 YES since df/du = 1 > 0 d) f(u) = log 10 u YES since df/du = (1/ln10)*(1/u) >0 e) f(u) = 1/ u NO since df/du = 1u2 < 0 f) f(u) = 1/ u YES since df/du = 1u2 > 0 Econ 313.1  Wissink  Fall 2005 PS#1 – XtraQ  ANSWERS 20, 70 60, 60 60 70 x y 70 60 communications scheme 60 50 20 20 50 70 (60, 50) 20, 70 x y economics scheme...
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 Fall '06
 MASSON
 Microeconomics, Convex function, Nancy, Convex preferences

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