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How certain are we about the certainty-equivalent longterm social discount rate?

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  • Freeman, Mark C.
  • Groom, Ben

Abstract

Theoretical arguments for using a term structure of social discount rates (SDR) that declines with the time horizon have influenced Government guidelines in the US and Europe. The certainty equivalent discount rate that often underpins this guidance embodies uncertainty in the primitives of the SDR, such as growth. For distant time horizons the probability distributions of these primitives are ambiguous and the certainty equivalent itself is uncertain. Yet, if a limited set of characteristics of the unknown probability distributions can be agreed upon, 'sharp'upper and lower bounds can be defined for the certainty-equivalent SDR. Unfortunately, even with considerable agreement on these features, these bounds are widely spread for horizons beyond 75 years. So while estimates of the present value of intergenerational impacts, including the social cost of carbon, can be bounded in the presence of this ambiguity, they typically remain so imprecise as to provide little practical guidance.

Suggested Citation

  • Freeman, Mark C. & Groom, Ben, 2016. "How certain are we about the certainty-equivalent longterm social discount rate?," LSE Research Online Documents on Economics 67258, London School of Economics and Political Science, LSE Library.
    • Handle: RePEc:ehl:lserod:67258
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    File URL: http://eprints.lse.ac.uk/67258/
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    References listed on IDEAS

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    Cited by:

    1. Richard S.J. Tol, 2018. "The impact of climate change and the social cost of carbon," Working Paper Series 1318, Department of Economics, University of Sussex Business School.
    2. Claxton, Karl & Asaria, Miqdad & Chansa, Collins & Jamison, Julian & Lomas, James & Ochalek, Jessica & Paulden, Mike, 2019. "Accounting for timing when assessing health-related policies," LSE Research Online Documents on Economics 100038, London School of Economics and Political Science, LSE Library.
    3. Jarisch, Isabelle & Bödeker, Kai & Bingham, Logan Robert & Friedrich, Stefan & Kindu, Mengistie & Knoke, Thomas, 2022. "The influence of discounting ecosystem services in robust multi-objective optimization – An application to a forestry-avocado land-use portfolio," Forest Policy and Economics, Elsevier, vol. 141(C).
    4. Michael D. Bauer & Glenn D. Rudebusch, 2023. "The Rising Cost of Climate Change: Evidence from the Bond Market," The Review of Economics and Statistics, MIT Press, vol. 105(5), pages 1255-1270, September.
    5. Hann, Veryan, 2020. "Transition to decentralised electricity storage: The complexities of consumer decision-making and cost-benefit analyses," Energy Policy, Elsevier, vol. 147(C).
    6. Graeme Guthrie, 2021. "Discounting, Disagreement, and the Option to Delay," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 80(1), pages 95-133, September.
    7. Richard S.J. Tol, 2021. "Estimates of the social cost of carbon have not changed over time," Working Paper Series 0821, Department of Economics, University of Sussex Business School.
    8. Claxton, Karl & Asaria, Miqdad & Chansa, Collins & Jamison, Julian & Lomas, James & Ochalek, Jessica & Paulden, Mike, 2019. "Accounting for Timing when Assessing Health-Related Policies," Journal of Benefit-Cost Analysis, Cambridge University Press, vol. 10(S1), pages 73-105, April.
    9. Lanlan Luo & Shou Chen & Ziran Zou, 2020. "Determining the Generalized Discount Rate for Risky Projects," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 77(1), pages 143-158, September.
    10. Richard S. J. Tol, 2021. "Estimates of the social cost of carbon have increased over time," Papers 2105.03656, arXiv.org, revised Aug 2022.

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    More about this item

    Keywords

    Declining discount rates; Distribution uncertainty; Social Cost of Carbon.;
    All these keywords.

    JEL classification:

    • H43 - Public Economics - - Publicly Provided Goods - - - Project Evaluation; Social Discount Rate
    • Q51 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Valuation of Environmental Effects

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