The members of every household confront the question of whether they are saving enough for retirement. Some who have saved enough ex ante to have covered most, but not all, contingencies may wish that they had saved more, while others may discover that their retirement resources are more than sufficient to support their lifestyle. There are unpredictable expenditure needs in retirement, and households cannot insure against all of them. The challenge facing individual households arises more generally when researchers and public policy analysts attempt to evaluate the adequacy of retirement preparation by various age cohorts in the U.S. population. Whether the "Baby Boom" generation has saved enough to provide for a secure retirement is a frequent topic of both scholarly and popular debate. There are many studies of retirement saving adequacy, and their results bear directly on tax and regulatory policy debates surrounding the design of retirement saving vehicles such as Individual Retirement Accounts, 401(k) plans, and 403(b) plans. They also feature in discussions of the changing role and nature of defined benefit pension plans, and of the current and future role of Social Security in supporting older households.Despite a voluminous research literature on saving behavior and retirement planning, whether U.S. households are saving enough for retirement remains controversial. In part, this is because of the heterogeneity of household circumstances. It is difficult to make general statements about the retirement preparation of an entire age cohort when earnings trajectories, wealth holdings, future health status and associated medical spending needs, and preferences regarding retirement consumption vary widely. This paper highlights a number of dimensions of household heterogeneity that bear on assessments of retirement saving adequacy. It then describes several metrics for judging retirement saving adequacy.
Twelve Questions for Retirement SaversTo illustrate the role of heterogeneity in circumstances and preferences that bear on the design of a retirement saving program, consider the information that a married couple in their mid-50s would need to evaluate when determining how much they need to save for retirement. There are at least a dozen questions that can significantly affect the appropriate level of retirement saving. Many of them can only be answered with probability distributions. This makes it challenging for many households to develop meaningful answers to these questions, and it complicates the formulation of a retirement saving plan. I describe these questions, and comment on the heterogeneity across households that each highlights.(i) How long are we likely to live? In addition to considering current information on life expectancy in the population as a whole, a married couple needs to consider their current health status, and the substantial differences in life expectancy that are associated with socio-economic status. Uncertainty about length of life is one of the most important risks facing an old...