According to the budget office, which analyzed the plan using assumptions dictated by House Republicans, the proposal calls for spending on items other than Social Security, Medicare and Medicaid ??? but including defense ??? to fall from 12 percent of G.D.P. last year to 6 percent of G.D.P. in 2022, and just 3.5 percent of G.D.P. in the long run.That last number is less than we currently spend on