The social rate of discount, climate change and real options
This paper examines the controversial problem of the choice of the social discount rate in development projects, by focusing on the investment required to adapt to climate change, considering the threats to food security and the needs for human and natural capital, especially for developing countries. Because climate change introduces negative trends and time increasing volatilities both in production and in consumption, social rates of discount can only be estimated within a framework of dynamic uncertainty. For this purpose, climate change can be modeled as a twin stochastic process of the geometric Brownian motion variety, affecting both consumption and productive capacity. Unlike the case of deterministic neoclassical growth, and contrary to the usual estimates for project evaluation, the stochastic nature of climate changes links the social discount rate (SDR) to volatility in two distinct and important ways. On the side of consumption and growth, the SDR is reduced by the likely negative effects of climate change (CC) on growth and food security. It also becomes dependent on the fact that the volatility of growth favors the accumulation of precautionary savings and thus reduces the rate of fall of the value of consumption over time. On the side of production capacity, the SDR is also reduced by the negative effect of CC on the productivity of capital and by the fact that the opportunity cost of the displacement of private investment under dynamic uncertainty is lowered by the value of the options to invest when more information will be available.
|Date of creation:||18 Feb 2014|
|Date of revision:||18 Feb 2014|
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- Jonathan S. Skinner, 1987.
"Risky Income, Life Cycle Consumption, and Precautionary Savings,"
NBER Working Papers
2336, National Bureau of Economic Research, Inc.
- Skinner, Jonathan, 1988. "Risky income, life cycle consumption, and precautionary savings," Journal of Monetary Economics, Elsevier, vol. 22(2), pages 237-255, September.
- Philip Merrigan & Michel Normandin, 1994.
"Precautionary Saving Motives: An Assessment from U.K. Time Series of Cross-Sections,"
Cahiers de recherche CREFE / CREFE Working Papers
29, CREFE, Université du Québec à Montréal.
- Merrigan, Philip & Normandin, Michel, 1996. "Precautionary Saving Motives: An Assessment from UK Time Series of Cross-Sections," Economic Journal, Royal Economic Society, vol. 106(438), pages 1193-1208, September.
- Martin L. Weitzman, 2007. "A Review of the Stern Review on the Economics of Climate Change," Journal of Economic Literature, American Economic Association, vol. 45(3), pages 703-724, September.
- Giuseppe Grande & Luigi Ventura, 2001.
"Labor Income and Risky Assets under Market Incompleteness: Evidence from Italian Data,"
Temi di discussione (Economic working papers)
399, Bank of Italy, Economic Research and International Relations Area.
- Grande, Giuseppe & Ventura, Luigi, 2002. "Labor income and risky assets under market incompleteness: Evidence from Italian data," Journal of Banking & Finance, Elsevier, vol. 26(2-3), pages 597-620, March.
- Mehra, Rajnish & Prescott, Edward C., 1985.
"The equity premium: A puzzle,"
Journal of Monetary Economics,
Elsevier, vol. 15(2), pages 145-161, March.
- Karen E. Dynan, 1993. "How prudent are consumers?," Working Paper Series / Economic Activity Section 135, Board of Governors of the Federal Reserve System (U.S.).
- Dynan, Karen E, 1993. "How Prudent Are Consumers?," Journal of Political Economy, University of Chicago Press, vol. 101(6), pages 1104-13, December.
- Martin Browning & Annamaria Lusardi, 1995.
"Household Saving: Micro Theories and Micro Facts,"
Department of Economics Working Papers
1995-02, McMaster University.
- Blake, David, 1996. "Efficiency, Risk Aversion and Portfolio Insurance: An Analysis of Financial Asset Portfolios Held by Investors in the United Kingdom," Economic Journal, Royal Economic Society, vol. 106(438), pages 1175-92, September.
- Barsky, Robert B, et al, 1997. "Preference Parameters and Behavioral Heterogeneity: An Experimental Approach in the Health and Retirement Study," The Quarterly Journal of Economics, MIT Press, vol. 112(2), pages 537-79, May.
- Adam J. Grossberg, 1991. "Personal Saving under Income Uncertainty: A Test of the Intertemporal Substitution Hypothesis," Eastern Economic Journal, Eastern Economic Association, vol. 17(2), pages 203-210, Apr-Jun.
- Jonathan A. Parker, 1999. "The Reaction of Household Consumption to Predictable Changes in Social Security Taxes," American Economic Review, American Economic Association, vol. 89(4), pages 959-973, September.
- Kuehlwein, Michael, 1991. "A test for the presence of precautionary saving," Economics Letters, Elsevier, vol. 37(4), pages 471-475, December.
- William D. Nordhaus, 2007. "A Review of the Stern Review on the Economics of Climate Change," Journal of Economic Literature, American Economic Association, vol. 45(3), pages 686-702, September.
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