Under the Ryan budget, “Mandatory and Defense and Nondefense Discretionary Spending” – which includes Function 920 Allowances, but excludes Social Security, Medicare and Medicaid — would fall from 12.5 percent of Gross Domestic Product in 2011 to 6.75 percent in 2023, 5.75 percent in 2030, 4.75 percent in 2040 and 3.75 percent in 2050, according to an analysis by the Congressional Budget Office.
The C.B.O. cautiously notes how difficult it would be to cut such spending to 3.75 percent of G.D.P.:
By comparison, spending in this category has exceeded 8 percent of G.D.P. in every year since World War II. Spending for defense alone has not been lower than 3 percent of G.D.P. in any year during that period.
Romney, in fact, has committed himself to keeping the Pentagon budget (Function 050) at 4 percent of G.D.P. By 2050, that would leave zilch under the Ryan plan for such separately funded programs as Veterans Benefits (Function 700); the administration of justice, including the F.B.I. (Function 750); Education, Train and Social Services (Function 500), and pretty much anything else.