Without full employment, tax revenues are lower, government expenditures are higher.
The past fifty years of government history shows that expenditure grow something like 1.2 times what ever income.
Reagan didn’t cut spending. Bush/Hasteret/Lott era blew LBJ out of the water.
Theory aside, history so far, nothing effects spending growth increases. They continue at the Fed level. Why? Because of our old friend, FRB, inc.