Musings on the Social Discount Rate 1

Arnold C. Harberger and Glenn Jenkins ()

Journal of Benefit-Cost Analysis, 2015, vol. 6, issue 1, 6-32

Abstract: This paper is mainly concerned with weighted-average measures of the social discount rate, where the components of the average are the marginal productivity of investment (measured by its gross-of-tax rate of return), and the marginal rate of time preference (measured by the net-of-tax yield of capital). We believe that these components should best be measured using data (the national accounts) that span the whole economy and reflect the product actually produced and the rewards actually perceived. We use a methodology based on just four familiar parameters to generate productivity estimates applicable to a wide range of countries. In the process, we make an adjustment for infrastructure investment, also excluding income from land, monopoly markups, supra-marginal returns due to increases in total factor productivity (TFP), and returns to capital in financial intermediation. The end products are estimates of social discount rates averaging around 8% for the advanced countries, and 10% for healthy developing countries and Asian Tigers.

Date: 2015
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