Marginal Propensity to consume or known as (MPC) relates to a change in net or total consumption expenditure to a change in the total disposable income.

Symbolically it is written as
    
MPC = ?C/?Y

where, ?C is the Change in total consumption expenditure and

?Y is the Change in total disposable income.

Let Suppose, the total disposable income in an economy increases from $ 10,000 crore to $ 20,000 crore & the consumption expenditure rises from $ 8,000 crore to $ 15,000 crore, then the MPC will be calculated as follows: