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W. T. ZIEMBA<br />

one may differentiate under the integral sign because u is continuously<br />

differentiable and the absolute expected marginal utility is bounded (see<br />

Loeve [16]).<br />

(d) The proofs remain valid as long as the appropriate absolute integrals<br />

remain finite. We show here for case (a) that J|«(w)|dF(w) < oo; similar<br />

arguments may be used to establish (b) and (c).<br />

Suppose vt > 0. Then without loss of generality we may take vx = 1<br />

(andLj = 1). Now lim|W|_00(|«(w)|/|w|'') = 1 if and only if for all e such that<br />

0| / ' , |

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