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The law of demand versus diminishing marginal utility

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  • Bettie, Bruce R.
  • Lafrance, Jeffrey T.

Abstract

Diminishing marginal utility (DMU) is neither necessary nor sufficient for downward-sloping demand. Yet, upper-division undergraduate and beginning graduate students often presumeotherwise. This paper provides two simple counter-examples that can be used to help students understand that the Law of Demand does not depend on DMU. The examples are accompaniedwith the geometry and basic mathematics of the utility functions and the implied ordinary/Marshallian demands.

Suggested Citation

  • Bettie, Bruce R. & Lafrance, Jeffrey T., 2006. "The law of demand versus diminishing marginal utility," Department of Agricultural & Resource Economics, UC Berkeley, Working Paper Series qt9c73m45q, Department of Agricultural & Resource Economics, UC Berkeley.
    • Handle: RePEc:cdl:agrebk:qt9c73m45q
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    1. Jeffrey T. LaFrance & Harry de Gorter, 1985. "Regulation in a Dynamic Market: The U.S. Dairy Industry," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 67(4), pages 821-832.
    2. Cicchetti, Charles J & Fisher, Anthony C & Smith, V Kerry, 1976. "An Econometric Evaluation of a Generalized Consumer Surplus Measure: The Mineral King Controversy," Econometrica, Econometric Society, vol. 44(6), pages 1259-1276, November.
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    4. Mas-Colell, Andreu & Whinston, Michael D. & Green, Jerry R., 1995. "Microeconomic Theory," OUP Catalogue, Oxford University Press, number 9780195102680.
    5. von Haefen, Roger H., 2002. "A Complete Characterization Of The Linear, Log-Linear, And Semi-Log Incomplete Demand System Models," Journal of Agricultural and Resource Economics, Western Agricultural Economics Association, vol. 27(2), pages 1-39, December.
    6. LaFrance, Jeffrey T., 1985. "Linear demand functions in theory and practice," Journal of Economic Theory, Elsevier, vol. 37(1), pages 147-166, October.
    7. Hausman, Jerry A, 1981. "Exact Consumer's Surplus and Deadweight Loss," American Economic Review, American Economic Association, vol. 71(4), pages 662-676, September.
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    Cited by:

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    2. Ruijs, Arjan, 2007. "Welfare and Distribution Effects of Water Pricing Policies," Natural Resources Management Working Papers 7441, Fondazione Eni Enrico Mattei (FEEM).
    3. Arjan Ruijs, 2009. "Welfare and Distribution Effects of Water Pricing Policies," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 43(2), pages 161-182, June.
    4. Arjan Ruijs, 2007. "Welfare and Distribution Effects of Water Pricing Policies," Working Papers 2007.92, Fondazione Eni Enrico Mattei.

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