"Since the 1990s, our retirement system has been based on three pillars: government benefits, pensions from employers, and additional private saving. This report redefines each pillar for the modern labor force and financial markets -- and it proposes adding a fourth.... As part of the second pillar, 401(k)s could provide retirees with stable income. Yet this option remains rare because of regulatory hurdles.... Reimagining the retirement system requires adding a fourth pillar: working into retirement.... [R]ight now, obstacles -- on both the supply and demand side -- prevent many older Americans from working at all, even if they would like to do so."  MORE >>