In recent years a decline in the labor force participation of older workers has combined with rapid current and projected increases in the number of older Americans, producing major policy debates over looming "crises" in social security and, to a lesser extent, in the private pension system....

We are engaged in a long-term project to analyze the determinants of health care cost differences across firms. An important first step is to summarize the nature of expenditure differences across plans. The goal of this article is to develop methods for identifying and quantifying those factors...