Public spending

Government spending or expenditure includes all government consumption, investment, and transfer payments. In national income accounting the acquisition by governments of goods and services for current use, to directly satisfy the individual or collective needs of the community, is classed as government final consumption expenditure. Government acquisition of goods and services intended to create future benefits, such as infrastructure investment or research spending, is classed as government investment (government gross capital formation). These two types of government spending, on final consumption and on gross capital formation, together constitute one of the major components of gross domestic product.

Government spending can be financed by government borrowing, seigniorage, or taxes. Changes in government spending is a major component of fiscal policy used to stabilize the macroeconomic business cycle.

For fiscal policy, increases in government spending are expansionary, while decreases are contractionary. John Maynard Keynes was one of the first economists to advocate government deficit spending (increased government spending financed by borrowing) as part of the fiscal policy response to an economic contraction. According to Keynesian economics, increased government spending raises aggregate demand and increases consumption, which leads to increased production and faster recovery from recessions. Classical economists, on the other hand, believe that increased government spending exacerbates an economic contraction by shifting resources from the private sector, which they consider productive, to the public sector, which they consider unproductive.

...
Wikipedia