The multiplier is a measure of the effect of a change in one variable on another variable in an economy. It indicates the amount by which the equilibrium level of income changes when there is a change in autonomous spending. The value of the multiplier depends on the marginal propensity to consume (MPC) and the level of income. The MPC is the fraction of additional income that is spent on consumption. The higher the MPC, the higher the multiplier, and the greater the impact of a change in spending on the level of income. The level of personal savings and government policy can also affect the multiplier, but they are not the only factors that determine its value.