In 2010, Medicare and Medicaid cost 5.0 percent of GDP and Social Security cost 4.8 percent of GDP. Combined, that’s less than 10 percent of GDP. By 2020, the combined cost of these three programs is already projected to grow to 11.4 percent of GDP; extrapolating forward at constant growth rates, their cost will be at about 14.4 percent of GDP by 2030.
