Social security reform in the United States continues to be a pressing and contentious issue, with advocates touting some form of a centralized or a privatized system of personal accounts. In general, centralized systems offer low administrative costs, but are potentially subject to political mismanagement and appropriation. Privatized account systems, on the other hand, offer higher yields with more flexibility, but may prove too expensive and logistically daunting to implement. Uniting learned and outspoken proponents on both sides of the debate, this volume provides the first comprehensive analysis of the issues involved in administering a system of essentially private social security accounts. The contributors together come to startlingly similar conclusions, generally agreeing that a centralized system of accounts could deliver the benefits of privatization in a feasible and cost-efficient way by accessing administrative mechanisms already in existence. This is perhaps the most far-reaching synthesis yet envisioned of functional and implementable social security reform.

Our current social security system operates on a pay-as-you-go basis; benefits are paid almost entirely out of current revenues. As the ratio of retirees to taxpayers increases, concern about the high costs of providing benefits in a pay-as-you-go system has led economists to explore other options. One involves "prefunding," in which a person's withholdings are invested in financial instruments, such as stocks and bonds, the eventual returns from which would fund his or her retirement. The risks such a system would introduce—such as the volatility in the market prices of investment assets—are the focus of this offering from the NBER. Exploring the issues involved in measuring risk and developing models to reflect the risks of various investment-based systems, economists evaluate the magnitude of the risks that both retirees and taxpayers would assume. The insights that emerge show that the risk is actually moderate relative to the improved return, as well as being balanced by the ability of an investment-based system to adapt to differences in individual preferences and conditions.