Working Paper: CEPR ID: DP13708
Authors: Stan Olijslager; Sweder van Wijnbergen
Abstract: We show that empirically strongly supported deviations from standard expected time separable utility have a major impact on estimates of the willingness to pay to avoid future climate change risk. We propose a relatively standard integrated climate/economy model but add stochastic climate disasters. The model yields closed form solutions up to solving an integral, and therefore does not suffer from the curse of dimensionality of most numerical climate/economy models. Introducing Epstein-Zin preferences with an elasticity of substitution higher than one and ambiguity aversion leads to much larger estimates of the social cost of carbon (SCC) than obtained under power utility. The dominant parameters are the risk aversion coefficient and the elasticity of intertemporal substitution. Ambiguity aversion has more complicated consequences but overall also leads to substantially higher estimates of the SCC.
Keywords: social cost of carbon; ambiguity aversion; epstein-zin preferences; stochastic differential utility; climate change
JEL Codes: Q51; Q54; G12; G13
Edges that are evidenced by causal inference methods are in orange, and the rest are in light blue.
| Cause | Effect |
|---|---|
| Epstein-Zin preferences (D11) | higher estimates of the SCC (C13) |
| ambiguity aversion (D81) | higher estimates of the SCC (C13) |
| risk aversion coefficient (D81) | SCC estimates (C13) |
| elasticity of intertemporal substitution (D15) | SCC estimates (C13) |
| ambiguity aversion complicates relationship (D81) | higher SCC estimates (C13) |
| neglecting complexities of risk pricing (G19) | underestimations of the SCC (C13) |