491. Models-as-Usual for Unusual Risks? On the Value of Catastrophic Climate Change
- Author:
- Antoine Bommier, Bruno Lanz, and Stéphane Zuber
- Publication Date:
- 11-2013
- Content Type:
- Working Paper
- Institution:
- Centre for International Environmental Studies, The Graduate Institute (IHEID)
- Abstract:
- We study the role of alternative intertemporal preference representations in a model of economic growth, stock pollutant and endogenous risk of catastrophic collapse. We contrast the traditional “discounted utility” model, which assumes risk neutrality with respect to intertemporal utility, with a multiplicative choice model that displays risk aversion in that dimension. First, we show that both representations of preferences can rationalize the same “business as usual” economy for a given interest rate and no pollution externality. Second, once we introduce a collapse risk whose hazard rate is a function of the pollution stock, multiplicative preferences recommend a much more stringent policy response. An illustration in the context of climate change indicates that switching to the multiplicative preference representation has a similar effect, in terms of policy recommendations, as scaling up the schedule of the hazard rate by a factor of 100.
- Topic:
- Climate Change, Environment, Risk, and Discounting
- Political Geography:
- Global Focus