Fiscal policy uses government spending, taxes, and borrowing to influence macroeconomic variables. Expansionary fiscal policy, such as tax cuts or increased spending, increases aggregate demand to boost a recession-plagued economy. Contractionary fiscal policy, like tax increases or spending cuts, decreases aggregate demand to curb inflation. Automatic stabilizers like unemployment insurance and the progressive tax system counter cyclical changes automatically. Discretionary policy actively manipulates fiscal tools but faces time lags and crowding out effects.