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Environmental Protection, Rare Disasters, and Discount Rates

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  • Robert J. Barro

Abstract

Extremely low discount rates play a central role in the Stern Review's evaluation of environmental protection, and this assumption has been criticized by many economists. The Review also stresses that great uncertainty is a critical element for optimal environmental policies. An appropriate model for this policy analysis requires sufficient risk aversion and fattailed uncertainty to get into the ballpark of explaining the observed equity premium. A satisfactory framework, based on Epstein-Zin/Weil preferences, also separates the coefficient of relative risk aversion (important for results on environmental investment) from the intertemporal elasticity of substitution for consumption (which matters little). Calibrations based on existing models of rare macroeconomic disasters suggest that optimal environmental investment can be a significant share of GDP even with reasonable values for the rate of time preference and the expected rate of return on private capital. The key parameters, yet to be pinned down, are the proportionate effect of environmental investment on the probability of environmental disaster and the baseline probability of environmental disaster.

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  • Robert J. Barro, 2013. "Environmental Protection, Rare Disasters, and Discount Rates," NBER Working Papers 19258, National Bureau of Economic Research, Inc.
    • Handle: RePEc:nbr:nberwo:19258
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    References listed on IDEAS

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    More about this item

    JEL classification:

    • E1 - Macroeconomics and Monetary Economics - - General Aggregative Models
    • G12 - Financial Economics - - General Financial Markets - - - Asset Pricing; Trading Volume; Bond Interest Rates
    • Q5 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics

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