The biggest question facing anyone considering retirement is financial: are my savings sufficient to provide for my lifestyle for the rest of my life? For the fortunate among us, the answer is yes. But for a large fraction of the population, the answer is likely no.

The typical U.S. household has few retirement savings. The National Institute on Retirement Security reports that the median for near-retirement households is $12,000, while that for all households is only $3,000. Most people are relying on government social security to meet their retirement needs.

There are many reasons for this. One is the reduction in the fraction of employers offering any retirement plan at all, and another is the shift away from defined-benefit (DB) and toward defined-contribution (DC) pension plans. The result is that many individuals face risks that they are not equipped to bear, and many households need to save substantially more than they would have had these changes not occurred....