How Should Benefits and Costs Be Discounted in an Intergenerational Context? The Views of an Expert Panel
AbstractIn September 2011, the US Environmental Protection Agency asked 12 economists how the benefits and costs of regulations should be discounted for projects that affect future generations. This paper summarizes the views of the panel on three topics -- the use of the Ramsey formula as an organizing principle for determining discount rates over long horizons, whether the discount rate should decline over time, and how intra- and intergenerational discounting practices can be made compatible. The panel members agree that the Ramsey formula provides a useful framework for thinking about intergenerational discounting. We also agree that theory provides compelling arguments for a declining certainty-equivalent discount rate. In the Ramsey formula, uncertainty about the future rate of growth in per capita consumption can lead to a declining consumption rate of discount, assuming that shocks to consumption are positively correlated. This uncertainty in future consumption growth rates may be estimated econometrically based on historic observations, or it can be derived from subjective uncertainty about the mean rate of growth in mean consumption or its volatility. Determining the remaining parameters of the Ramsey formula is, however, challenging.
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Bibliographic InfoPaper provided by Resources For the Future in its series Discussion Papers with number dp-12-53.
Date of creation: 19 Dec 2012
Date of revision:
discount rate; uncertainty; declining discount rate; benefit-cost analysis;
Find related papers by JEL classification:
- D61 - Microeconomics - - Welfare Economics - - - Allocative Efficiency; Cost-Benefit Analysis
This paper has been announced in the following NEP Reports:
- NEP-ALL-2013-05-11 (All new papers)
- NEP-ENE-2013-05-11 (Energy Economics)
- NEP-RES-2013-05-11 (Resource Economics)
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- Christian Gollier, 2008.
"Discounting with fat-tailed economic growth,"
Journal of Risk and Uncertainty,
Springer, vol. 37(2), pages 171-186, December.
- Lawrence H. Goulder & Roberton C. Williams III, 2012.
"The Choice of Discount Rate for Climate Change Policy Evaluation,"
NBER Working Papers
18301, National Bureau of Economic Research, Inc.
- Lawrence H. Goulder & Roberton C. Williams, 2012. "The Choice Of Discount Rate For Climate Change Policy Evaluation," Climate Change Economics (CCE), World Scientific Publishing Co. Pte. Ltd., vol. 3(04), pages 1250024-1-1.
- Goulder, Lawrence H. & Williams, Roberton C., 2012. "The Choice of Discount Rate for Climate Change Policy Evaluation," Discussion Papers dp-12-43, Resources For the Future.
- Narayana R. Kocherlakota, 1995.
"The equity premium: it's still a puzzle,"
Discussion Paper / Institute for Empirical Macroeconomics
102, Federal Reserve Bank of Minneapolis.
- Robert J. Barro, 2009.
"Rare Disasters, Asset Prices, and Welfare Costs,"
American Economic Review,
American Economic Association, vol. 99(1), pages 243-64, March.
- Barro, Robert, 2006. "Rare Disasters and Asset Markets in the Twentieth Century," Scholarly Articles 3208215, Harvard University Department of Economics.
- Newell, Richard G. & Pizer, William A., 2003.
"Discounting the distant future: how much do uncertain rates increase valuations?,"
Journal of Environmental Economics and Management,
Elsevier, vol. 46(1), pages 52-71, July.
- Pizer, William & Newell, Richard, 2000. "Discounting the Distant Future: How Much Do Uncertain Rates Increase Valuations?," Discussion Papers dp-00-45, Resources For the Future.
- Phoebe Koundouri & Theologos Pantelidis & Ben Groom & Ekaterini Panopoulou, 2007.
"Discounting the distant future: How much does model selection affect the certainty equivalent rate?,"
Journal of Applied Econometrics,
John Wiley & Sons, Ltd., vol. 22(3), pages 641-656.
- Ekaterini Panopoulou & B. Groom & P. Koundouri & Theologos Pantelidis, 2005. "Discounting the distant future: How much does model selection affect the certainty equivalent rate?," Economics, Finance and Accounting Department Working Paper Series n1480105, Department of Economics, Finance and Accounting, National University of Ireland - Maynooth.
- Donald Meyer & Jack Meyer, 2005. "Relative Risk Aversion: What Do We Know?," Journal of Risk and Uncertainty, Springer, vol. 31(3), pages 243-262, December.
- 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.
- Mankiw, N. Gregory, 1981. "The permanent income hypothesis and the real interest rate," Economics Letters, Elsevier, vol. 7(4), pages 307-311.
- Gollier, Christian, 2002. "Time Horizon and the Discount Rate," Journal of Economic Theory, Elsevier, vol. 107(2), pages 463-473, December.
- Christian Gollier, 2012. "Pricing the Planet's Future: The Economics of Discounting in an Uncertain World," Economics Books, Princeton University Press, edition 1, volume 1, number 9894.
- Cochrane, John H, 1988. "How Big Is the Random Walk in GNP?," Journal of Political Economy, University of Chicago Press, vol. 96(5), pages 893-920, October.
- Mark C. Freeman & Ben Groom, 2013. "How certain are we about the certainty-equivalent long term social discount rate?," Grantham Research Institute on Climate Change and the Environment Working Papers 138, Grantham Research Institute on Climate Change and the Environment.
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