Each year, CBO estimates the budgetary impact of the proposals in the President's budget using the agency's own economic assumptions and estimating techniques—thus enabling the Congress to compare the Administration's spending and revenue proposals to CBO's projections of spending and revenues under current law, and to other proposals, using a consistent set of economic and technical assumptions. CBO also estimates the economic impact of the proposals in the President’s budget and the "feedback effect" that those changes in the economy would have on the budget.