The U.S. workforce is mobile and always has been, which is one of the reasons that few workers accrue adequate savings. Furthermore, defined-benefit pensions have never been available to more than a small proportion of workers, and the decline of such plans was driven largely by ERISA. The bottom quartile of retirees rely on Social Security for 86 percent of their income, demonstrating that Social Security is essential for a significant portion of the population. If 401(k) and similar plans are to provide adequate retirement savings, provisions for withdrawing such savings before retirement must be removed and workers must be educated to stop borrowing and start saving.