Risk Aversion and Pricing Climate Risk

I felt the “Editor’s Corner” article in the most recent Financial Analysts Journal (Sept/Oct 2011) “Pricing Climate Change Risk Appropriately” does an excellent job explaining why the possibility of extreme climate scenarios justifies a considerably higher price for carbon than would be warranted under the most likely or average scenario: Humans are risk averse.

Equities… have low prices (and high expected returns) because their cash flows are discounted by society at high rates. The reason has to do with the anti-insurance aspect of equities: Their cash flows are highest in good states of nature whereby the value placed on the cash flows is low. In contrast, efforts to mitigate climate change by pricing carbon emissions will be most valuable to society if climate change turns out to have catastrophic consequences for society’s well-being. Because of this insurance aspect, society should be willing to pay higher prices for climate change mitigation.

FAJ Executive Editor Robert Litterman goes on to explain the mechanics behind carbon pricing models and their flaws, as well as why equity analysts are uniquely qualified to do these assessments.

I’ve long thought that financial market theory is uniquely applicable to understanding climate and the measures needed to mitigate climate change. what I don’t understand is why I hear so few analysts talking about it, so it was very refreshing to come across this article applying a deep understanding of economic pricing theory to what the greatest challenge the world will confront in the 21st century.

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