As Baby Boomers plan for their retirements, finance their children's educations, and provide for their families' medical expenses, they confront a fundamental reality: America today is a defined contribution society. We save for retirement, health care and educational savings through IRAs, 401(k) accounts, 529 programs, FSAs, HRAs, HSAs and other individual accounts which did not exist a generation ago. In its own way, the emergence of these accounts has been a revolution which has, step-by-step, without fanfare, cumulatively transformed tax and social policy in fundamental ways. The Origins...