Prioritarianism and Climate Change

Environmental and Resource Economics 62: 279-308 (2015)

Posted: 31 May 2016 Last revised: 14 Jul 2016

See all articles by Matthew D. Adler

Matthew D. Adler

Duke University School of Law

Nicolas Treich

University of Toulouse 1 - Toulouse School of Economics (TSE)

Date Written: August 29, 2015

Abstract

Prioritarianism is the ethical view that gives greater weight to well-being changes affecting individuals at lower well-being levels. This view is influential both in moral philosophy, and in theoretical work on social choice — where it is captured by a social welfare function (“SWF”) summing a concave transformation of individual well-being numbers. However, prioritarianism has largely been ignored by scholarship on climate change. This Article compares utilitarianism and prioritarianism as frameworks for evaluating climate policy. It reviews the distinctive normative choices that are required for the prioritarian approach: specifying a ratio scale for well-being (if the prioritarian SWF takes the standard “Atkinson” form); determining the degree of concavity of the transformation function (i.e., the degree of social inequality aversion); and choosing between “ex ante” and “ex post” prioritarianism under conditions of risk. The Article also sketches some of salient implications of a prioritarian SWF for climate policy — with respect to the social cost of carbon, the social discount rate, optimal mitigation, and the “dismal theorem.” Finally, it discusses the issue of variable population.

Keywords: climate change, social choice, social welfare function, prioritarianism, risk and uncertainty, population

Suggested Citation

Adler, Matthew D. and Treich, Nicolas, Prioritarianism and Climate Change (August 29, 2015). Environmental and Resource Economics 62: 279-308 (2015). Available at SSRN: https://ssrn.com/abstract=2786282

Matthew D. Adler (Contact Author)

Duke University School of Law ( email )

210 Science Drive
Box 90362
Durham, NC 27708
United States

Nicolas Treich

University of Toulouse 1 - Toulouse School of Economics (TSE) ( email )

Place Anatole-France
Toulouse Cedex, F-31042
France

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