Risk Aversion, Intergenerational Equity and Climate Change
The paper investigates a climate-economy model with an iso-elastic welfare function in which one parameter γ measures relative risk-aversion and a distinct parameter ρ measures resistance to intertemporal substitution.We show both theoretically and numerically that climate policy responds differently to variations in the two parameters. In particular, we show that higher γ but lower ρ leads to increase emissions control. We also argue that climate-economy models based on intertemporal expected utility maximization, i.e. models where γ = ρ, may misinterpret the sensitivity of the climate policy to risk-aversion.
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- Arrow, K.J. (1999), Discounting, Morality and Gaming, chapter 2. Washington, DC: Resources for the Future.Google Scholar
- Barsky, R.B., F.T. Juster, M. Kimball and M.D. Shapiro (1997), 'Preferences Parameters and Behavioral Heterogeneity: An Experimental Approach in the Health and Retirement Study', Quarterly Journal of Economics, 537–579.Google Scholar
- Ha-Duong, M., M.J. Grubb and J.-C. Hourcade (1997), 'Influence of Socioeconomic Inertia and Uncertainty on Optimal CO2-emission Abatement', Nature 390, 270–274.Google Scholar
- Ha-Duong, M. and N. Treich (2000), Recursive intergenerational utility in global climate risk modeling. NOTA DI LAVORO 92.99, Fondazione Eni Enrico Mattei, 2000. Also presented at EMF/IEW meeting in Stanford, July 2000, at Journees de l'IDEI, Toulouse, 16–17 June 1999. Also presented at the EUREQUA, Paris Environmental Economics Seminar, 2 December 1999.Google Scholar
- Hall, R.E. (1988), 'Intertemporal Substitution in Consumption', Journal of Political Economy 96, 338–357.Google Scholar
- Kreps, D. and E. Porteus (1978), 'Temporal Resolution of Uncertainty and Dynamic Choice Theory', Econometrica 46, 185–200.Google Scholar
- Nordhaus, W.D. (1994), Managing the Global Commons. Cambridge, Massachusetts: MIT Press.Google Scholar
- Selden, L. (1978), 'A New Representation of Preferences over “Certain × Uncertain” Pairs: The “Ordinal Certainty Equivalent Hypothesis”', Econometrica 16, 1045, 1060.Google Scholar
- Working Group III IPCC (ed.) (2000), Summary for Policymakers of IPCC Special Report on Emissions Scenarios. UNEP-WMO.Google Scholar