Erik Biørn: Dept. of Economics, University of Oslo, Postal: Department of Economics, University of Oslo, P.O Box 1095 Blindern, N-0317 Oslo, Norway
Abstract: How are substitution in the spatial and in the temporal sense connected? Can estimates based on data with spatial variation be transmitted into values appropriate for exploring temporal variation, and vice versa? This paper, building on, inter alia, Frisch (1959), attempts to give some clarifications and provides elements of a synthesis. The income elasticity of the marginal utility of income, whose inverse is often called the ‘Frisch parameter’, and its multi-period counterpart, the wealth elasticity of the marginal utility of wealth, are key concepts. Three cases with additive preferences are discussed, and in that context the role of the (generalized) ‘Frisch parameter’ as an overall measure of substitution across commodities and over time is reconsidered.
26 pages, July 3, 2017
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