Although much research has focused on recent increases in annual earnings inequality in the United States, the increases could have come from either of two sources: the distribution of lifetime earnings could have become more unequal or the receipt of lifetime earnings could have become more unstable. Based on an analysis of the 1968–92 Panel Study of Income Dynamics, we find that lifetime earnings inequality increased during the early 1980s and that earnings instability increased during the 1970s. We also examine how these trends are related to changes in the distribution of wages and hours and the returns to education.

Previous research finds a systematic decrease in consumption at retirement, a finding that is inconsistent with the life cycle/permanent income hypothesis if retirement is an expected event. In this paper, we use workers' subjective beliefs about their retirement dates as an instrument for retirement. After demonstrating that subjective retirement expectations are strong predictors of subsequent retirement decisions, we still find a consumption decline at retirement for workers who retire when expected. However, our estimates of this consumption fall are about a third less than those found when we instead rely on the instrumental variables strategy used in prior studies.

Why Did the Welfare Rolls Fall During the 1990's? The Importance of Entry by Jeffrey Grogger, Steven J. Haider and Jacob Klerman. Published in volume 93, issue 2, pages 288-292 of American Economic Review, May 2003