During a recession, or a recessionary gap, as Keynes called it, an increase in government spending will result in additional rounds of spending and income necessary to eventually reach full employment. Keynes's formula for the multiplier is: Multiplier = 1/(1-MPC).

What is the Keynesian equation?

Y = C + S The equality between Y, which represents income, and C + I + G, which represents total expenditures (or aggregate demand), is the (Keynesian) equilibrium condition. This simple linear equation shows the general form of the relationship between income and consumption. It describes consumer behavior.

What is the multiplier effect formula?

The formula to determine the multiplier is M = 1 / (1 - MPC). Once the multiplier is determined, the multiplier effect, or amount of money needed to be injected into an economy, can also be determined. This amount is calculated by dividing the total amount of spending needed by the multiplier.