Discount Rates for Public Investment Under Uncertainty

Agnar Sandmo

Chapter 11 in Allocation under Uncertainty: Equilibrium and Optimality, 1974, pp 192-210 from Palgrave Macmillan

Abstract: Abstract The problem of efficient allocation of capital in a world of uncertainty has played a major role in the debate on the social rate of discount. One view, which has been advanced by Hirshleifer [7, 8] and supported by Diamond [6], is that differences in rates of return on capital in the private sector of the economy reflect differences in riskiness among alternative lines of investment, and that these differences are of normative significance for the allocation of capital in the public sector. Thus, when discounting costs and benefits of a particular type of public investment, the government should take as its discount rate the rate of return on capital in a private industry of similar riskiness. Another view, which counts Samuelson [17] and Vickrey [22] among its supporters, is that because of the extremely large and diversified investment portfolio held by the public sector, the marginal return from public investment as a whole is practically risk free and should be equated to the market rate on riskless bonds. In an important recent contribution Arrow and Lind [2] come to the same conclusion for a somewhat different reason; the total risk carried by the public sector is shared among so many that each individual’s risk burden becomes negligible.

Keywords: Public Sector; Stock Market; Discount Rate; American Economic Review; Marginal Productivity (search for similar items in EconPapers)
Date: 1974
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DOI: 10.1007/978-1-349-01989-2_11

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