Robert H. Litzenberger, Cherukuri U. Rao, Estimates of the Marginal Rate of Time Preference and Average Risk Aversion of Investors in Electric Utility Shares: 1960-66, The Bell Journal of Economics and Management Science, Vol. 2, No. 1 (Spring, 1971), pp. 265-277
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Litzenberger et al. (1971) studied this question.