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The Biden era EPA's SCC estimates reflected model runs in which discount rates were sometimes negative. See p. 65 here. www.epa.gov/system/files...

May 12, 2025, 2:54 PM

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          "alt": "There is no requirement in the model that the growth in consumption per capita, gt, be positive. If p is close to zero, then the discount rate will be negative when gt is negative. The SC-GHG estimates in this report include trial years in which the discount rate is negative. Most of these instances are due to negative growth rates in the RFF-SPs, but some trial years have a negative ge only after subtracting baseline climate damages as recommended by Kelleher and Wagner (2019). For these trial years, damages grow faster than",
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