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Checking Gollier and Weitzman's solution of the "Weitzman-Gollier puzzle"

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  • Szekeres, Szabolcs

Abstract

In "How should the distant future be discounted when discount rates are uncertain?" (2010) Gollier and Weitzman claimed having solved the Weitzman-Gollier puzzle, concluding from a risk-averse utility maximizing model that Weitzman discounting is qualitatively correct and that when uncertain annual interest rates are highly correlated, long term discount rates are declining functions of time. This paper quantifies a similar model and comes to the opposite conclusion. Weitzman discounting is wrong; there is no puzzle if the correct method is used. Risk-neutral discount rates are growing, rather than declining functions of time under the Weitzman assumptions. Risk-averse discount rates can be declining, but must not be used to discount risky project's cash flows; risk adjusted rates must be used instead. When long term market yields are a growing function of time, it makes no sense to invest in projects of similar risk but lesser yield, irrespective of one's degree of risk-aversion.

Suggested Citation

  • Szekeres, Szabolcs, 2017. "Checking Gollier and Weitzman's solution of the "Weitzman-Gollier puzzle"," Economics Discussion Papers 2017-11, Kiel Institute for the World Economy (IfW Kiel).
    • Handle: RePEc:zbw:ifwedp:201711
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    References listed on IDEAS

    as
    1. Gollier, Christian, 2004. "Maximizing the expected net future value as an alternative strategy to gamma discounting," Finance Research Letters, Elsevier, vol. 1(2), pages 85-89, June.
    2. Gollier, Christian & Weitzman, Martin L., 2010. "How should the distant future be discounted when discount rates are uncertain?," Economics Letters, Elsevier, vol. 107(3), pages 350-353, June.
    3. Gollier, Christian, 2009. "Should we Discount the Far-Distant Future at its Lowest Possible Rate?," Economics - The Open-Access, Open-Assessment E-Journal (2007-2020), Kiel Institute for the World Economy (IfW Kiel), vol. 3, pages 1-14.
    4. Weitzman, Martin L., 1998. "Why the Far-Distant Future Should Be Discounted at Its Lowest Possible Rate," Journal of Environmental Economics and Management, Elsevier, vol. 36(3), pages 201-208, November.
    Full references (including those not matched with items on IDEAS)

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    More about this item

    Keywords

    Weitzman-Gollier puzzle; declining discount rates; discounting;
    All these keywords.

    JEL classification:

    • D61 - Microeconomics - - Welfare Economics - - - Allocative Efficiency; Cost-Benefit Analysis
    • H43 - Public Economics - - Publicly Provided Goods - - - Project Evaluation; Social Discount Rate

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