This is the introduction and summary to the ninth phase of an ongoing project on Social Security Programs and Retirement Around the World. This project, which compares the experiences of a dozen developed countries, was launched in the mid 1990s, following decades of decline in the labor force...

A critical question for Social Security policy is how program incentives affect retirement behavior. We use the wealth of new data available through the Health and Retirement Survey (HRS) to examine the impact of Social Security incentives on male retirement. We implement forward-looking models...

"This ninth volume of the International Social Security series, which studies the social security and retirement experiences of 12 developed countries, examines the effects of pension reform on employment at older ages. In the two decades since the project began, a dramatic decline in men's...

In the two decades since the project began, the dramatic decline in men's labor force participation has ended and been replaced by sharply rising participation rates. Older women's participation has been rising as well. In this eighth phase of the project, we explore this phenomenon of working...

Trends in BMI values are estimated by centiles of the US adult population by birth cohorts 1886-1986 stratified by ethnicity. The highest centile increased by some 18 to 22 units in the course of the century while the lowest ones increased by merely 1 to 3 units. Hence, the BMI distribution...

The trend in the BMI values of the US population has not been estimated accurately because time series data are unavailable and because the focus has been on calculating period effects. In contrast to the prevailing strategies, we estimate the trend and rate of change of BMI values by birth...