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Risk-adjusted Social Discount Rates

Author

Listed:
  • Frédéric Cherbonnier

    (TSE-R - Toulouse School of Economics - UT Capitole - Université Toulouse Capitole - UT - Université de Toulouse - EHESS - École des hautes études en sciences sociales - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement)

  • Christian Gollier

    (TSE-R - Toulouse School of Economics - UT Capitole - Université Toulouse Capitole - UT - Université de Toulouse - EHESS - École des hautes études en sciences sociales - CNRS - Centre National de la Recherche Scientifique - INRAE - Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement)

Abstract

When evaluating public and private investment projects, those that contribute more to the collective risk should be more penalized through an upward adjustment of their discount rate. This paper shows how to estimate the risk-adjusted discount rate for different projects, with applications to the electricity sector. Using the standard framework of consumer theory, we express any investment project's beta in terms of the easier-to-measure price and income elasticities of the goods generated by the project. When considering an investment in production capacity, the beta has a flat term structure, and is positive (negative) for normal (inferior) goods. When considering core infrastructures carrying goods or services, such as energy transmission and distribution assets, the beta has a decreasing term structure with very high values at short horizons for infrastructures facing capacity constraints. We provide a real-case example of a cross-border electricity connection with negative beta for the exporting country.

Suggested Citation

  • Frédéric Cherbonnier & Christian Gollier, 2022. "Risk-adjusted Social Discount Rates," Post-Print hal-04012977, HAL.
    • Handle: RePEc:hal:journl:hal-04012977
    DOI: 10.5547/01956574.43.4.fche
    Note: View the original document on HAL open archive server: https://hal.science/hal-04012977
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    References listed on IDEAS

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    Keywords

    Investment theory; Risk-adjusted discount rate; Public investment; Electricity transmission; Capacity investment; Cross-border transmission network;
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