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Social Security Investment in Equities I: Linear Case

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  • Peter Diamond
  • Jean Geanakoplos

Abstract

Social Security trust fund portfolio diversification to include some equities reduces the equity premium by raising the safe real interest rate. This requires changes in taxes. Under the hypothesis of constant marginal returns to risky investments, trust fund diversification lowers the price of land, increases aggregate investment, and raises the sum of household utilities, suitably weighted. It makes workers who do not own equities on their own better off, though it may hurt some others since changed taxes and asset values redistribute wealth across contemporaneous households and across generations. In our companion paper we reconsider the effects of diversification when there are decreasing marginal returns to safe and risky investment. Our analysis uses a two-period overlapping generations general equilibrium model with two types of agents, savers and workers who do not save. The latter represent approximately half of all workers who hold no equities whatsoever.

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Bibliographic Info

Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number 7103.

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Date of creation: Apr 1999
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Handle: RePEc:nbr:nberwo:7103

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  1. Olivia S. Mitchell & James F. Moore, 1997. "Retirement Wealth Accumulation and Decumulation: New Developments and Outstanding Opportunities," Center for Financial Institutions Working Papers 97-12, Wharton School Center for Financial Institutions, University of Pennsylvania.
  2. Peter Diamond, 2004. "Social Security," American Economic Review, American Economic Association, vol. 94(1), pages 1-24, March.
  3. Peter A. Diamond, 1997. "Macroeconomics Aspects of Social Security Reform," Brookings Papers on Economic Activity, Economic Studies Program, The Brookings Institution, vol. 28(2), pages 1-88.
  4. Henning Bohn, 1997. "Social Security reform and financial markets," Conference Series ; [Proceedings], Federal Reserve Bank of Boston, vol. 41(Jun), pages 193-227.
  5. John Geanakoplos & Olivia S. Mitchell & Stephen P. Zeldes, . "Social Security Money's Worth," Pension Research Council Working Papers 98-9, Wharton School Pension Research Council, University of Pennsylvania.
  6. Arthur B. Kennickell & Martha Starr-McCluer & Annika E. Sunden, 1997. "Family finances in the U.S.: recent evidence from the Survey of Consumer Finances," Federal Reserve Bulletin, Board of Governors of the Federal Reserve System (U.S.), issue Jan, pages 1-24.
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Cited by:
  1. Saku Aura & Peter Diamond Author-X-Name-Peter & John Geanakoplos, . "Savings and Portfolio Choice in a Two-Period Two-Asset Model," Cowles Foundation Discussion Papers 1268, Cowles Foundation for Research in Economics, Yale University.
  2. Simon Grant & John Quiggin, 2002. "The Risk Premium for Equity: Implications for the Proposed Diversification of the Social Security Fund," American Economic Review, American Economic Association, vol. 92(4), pages 1104-1115, September.
  3. Deborah Lucas & Marvin Phaup, 1975. "The Cost of Risk to the Government and Its Implications for Federal Budgeting," NBER Chapters, in: Measuring and Managing Federal Financial Risk, pages 29-54 National Bureau of Economic Research, Inc.
  4. Andrew B. Abel, 2001. "The Effects of Investing Social Security Funds in the Stock Market When Fixed Costs Prevent Some Households from Holding Stocks," American Economic Review, American Economic Association, vol. 91(1), pages 128-148, March.
  5. Menezes, Carmen F. & Henry Wang, X. & Bigelow, John P., 2005. "Duality and consumption decisions under income and price risk," Journal of Mathematical Economics, Elsevier, vol. 41(3), pages 387-405, April.
  6. Assaf Razin & Efraim Sadka, 2003. "Privatizing Social Security Under Balanced-Budget Constraints: A Political-Economy Approach," CESifo Working Paper Series 1039, CESifo Group Munich.
  7. Eisen, Roland, 2000. "(Partial) privatization social security: The Chilean model - a lesson to follow?," CFS Working Paper Series 2000/13, Center for Financial Studies (CFS).

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