Federal Reserve Chairman Alan Greenspan told Congress earlier this year that everyone knows there’s a Social Security crisis. That’s like saying "everyone knows the earth is flat."
Starting with a faulty premise guarantees reaching the wrong conclusion. The truth is there is no Social Security crisis, but there is a potential crisis in retirement income security and there may be a crisis in the future in U.S. financial markets. It’s this latter crisis that Greenspan actually is worried about.
Social Security is the most successful insurance program ever created. It insures millions of workers against what economists call "longevity risk," the possibility they will live "too long" and not be able to work long enough, or save enough, to provide their own income. Today, about 10% of those over age 65 live in poverty. Without Social Security, that rate would be almost 50%.
Congress expected that private-sector pensions eventually would cover most workers. But pension coverage peaked at 40% in the 1960s. Since then, corporations have systematically dismantled pension systems. Today, only 16% of private-sector workers are covered by defined-benefit pensions. Rather than supplementing private pensions, Social Security has become the primary source of retirement income for almost two-thirds of retirees. Thus, Congress was forced to raise benefit levels in 1972.
http://www.dollarsandsense.org/1104orr.html