This much is certain: The welfare state as we know it cannot survive. No serious student of entitlements thinks that we can let federal spending on Social Security, Medicare and Medicaid rise from its current 9% of GDP to the 28% of GDP that it will consume in 2050 if past growth rates continue. The problems facing transfer programs for the poor are less dramatic but, in the long term, no less daunting; the falling value of a strong back and the rising value of brains will eventually create a class society making a mockery of America's ideals unless we come up with something more creative than anything that the current...