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Low discount rates and insignificant environmental values

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  • Price, Colin
Abstract
Difference between the discount rate on consumption and the rate of return on investment is often taken to prevent the former's being used as a social discount rate. Yet techniques have long been known for incorporating both these rates in a shadow price of investment funds. Assumptions about the proportion of investment revenues saved and reinvested are crucial in determining whether a low discount rate favours or discriminates against long-term environmental values. Even a moderate saving rate may make the shadow price of funds indefinitely large. The conceptually correct discount rate then becomes the growth rate of investment funds, and the relative value of environmental effects becomes zero. Stochastic variation in rate of return makes this result more likely. Such an outcome may be avoided by setting reinvestment to zero, or assuming convergence of rates of return and discount, but no firm justification exists for these stratagems. However, various reasonable assumptions about environmental costs - especially, that they embody an investment element, or require adequate compensation to be paid - may make such costs indefinite also, and therefore capable of standing against indefinite values of investible funds.

Suggested Citation

  • Price, Colin, 2010. "Low discount rates and insignificant environmental values," Ecological Economics, Elsevier, vol. 69(10), pages 1895-1903, August.
    • Handle: RePEc:eee:ecolec:v:69:y:2010:i:10:p:1895-1903
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    References listed on IDEAS

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    Cited by:

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    2. Aleknevičienė, Vilija & Stončiuvienė, Neringa & Zinkevičienė, Danutė, 2013. "Determination of the fair value of a multifunctional family farm: a case study," Studies in Agricultural Economics, Research Institute for Agricultural Economics, vol. 115(3), pages 1-10, December.
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    4. Antonio Nesticò & Gabriella Maselli & Patrizia Ghisellini & Sergio Ulgiati, 2023. "A Dual Probabilistic Discounting Approach to Assess Economic and Environmental Impacts," Environmental & Resource Economics, Springer;European Association of Environmental and Resource Economists, vol. 85(1), pages 239-265, May.

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