Paul Krugman: Life, Death and Deficits

America’s political landscape is infested with many zombie ideas — beliefs about policy that have been repeatedly refuted with evidence and analysis but refuse to die. The most prominent zombie is the insistence that low taxes on rich people are the key to prosperity. But there are others.

And right now the most dangerous zombie is probably the claim that rising life expectancy justifies a rise in both the Social Security retirement age and the age of eligibility for Medicare. Even some Democrats — including, according to reports, the president — have seemed susceptible to this argument. But it’s a cruel, foolish idea — cruel in the case of Social Security, foolish in the case of Medicare — and we shouldn’t let it eat our brains.