Discussion Paper - Harvard Project on Climate Agreements, Belfer Center

Voting on Prices vs. Voting on Quantities in a World Climate Assembly

  • Martin L. Weitzman
| June 2015


This paper posits the conceptually useful allegory of a futuristic "World Climate Assembly" that votes on global carbon emissions via the basic principle of majority rule. Two variants are considered. One is to vote on a universal price (or tax) that is internationally harmonized, but the proceeds from which are domestically retained. The other is to vote on the overall quantity of total worldwide emissions, which are then distributed for free (via a pre-decided fractional subdivision formula) as individual allowance permits that are subsequently marketed in an international cap-and-trade system. The model of the paper suggests that the majority-voted price is likely to be less distortionary and easier to enact than the majority-voted total quantity of permits. While the study is centered on a formal model, the tone of the policy discussion resembles more an exploratory think piece.

Martin L. Weitzman, Harvard University

For more information on this publication: Please contact Harvard Project on Climate Agreements
For Academic Citation: Weitzman, Martin L.. “Voting on Prices vs. Voting on Quantities in a World Climate Assembly.” Discussion Paper, 2015-69, Harvard Project on Climate Agreements, Belfer Center, June 2015.

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