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Consumer surplus and budget constrained preference maximization: A note

Author

Listed:
  • Somdeb Lahiri

    (PD Petroleum University, School of Petroleum Management)

Abstract

The paper attempts to rectify what appear to be popular but elementary misconceptions about the concept of consumer surplus in the context of Marshallian demand curves. It is primarily addressed to teachers of microeconomics at the undergraduate level or in MBA programs of business schools. The main text informs the reader about the model/context and the results we are concerned with, all of the latter being a comprehensive teaching note, relegated to an appendix of the paper. Thus, the potential instructor may use the main text to motivate himself/herself and at the same time inform his/her students as to the topic i.e. the rehabilitation of consumer surplus as an exact measure of welfare from the stand-point of cost benefit analysis. Thereafter the appendix can be referred to for a more formal presentation. The technical results contained in the appendix begin by showing that willingness to pay is the area under the demand curve if and only if consumers are surplus maximizers. The last result in the appendix is a theoretically ‘happy ending’ since it shows that for purposes of applied economics, budget constrained preference maximization implies surplus maximization and hence for such consumers, willingness to pay is indeed the area under the demand curve up to the quantity consumed.

Suggested Citation

  • Somdeb Lahiri, 2020. "Consumer surplus and budget constrained preference maximization: A note," Managerial Economics, AGH University of Science and Technology, Faculty of Management, vol. 21(1), pages 49-65.
    • Handle: RePEc:agh:journl:v:21:y:2020:i:1:p:49-65
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    File URL: https://journals.agh.edu.pl/manage/article/view/4018/2530
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    References listed on IDEAS

    as
    1. Mandy, David, 2016. "Producers, Consumers, and Partial Equilibrium," Elsevier Monographs, Elsevier, edition 1, number 9780128110232.
    2. Takashi Hayashi, 2017. "General Equilibrium Foundation of Partial Equilibrium Analysis," Springer Books, Springer, number 978-3-319-56696-2, February.
    3. Takayama, Akira, 1982. "On consumer's surplus," Economics Letters, Elsevier, vol. 10(1-2), pages 35-42.
    Full references (including those not matched with items on IDEAS)

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