Answer 1

Average propensity to consume and Marginal propensity to consume. 

Basis of difference	Average propensity to consume	Marginal propensity to consume
Meaning	It shows the ratio of consumption expenditure to the level of income	It refers to the ratio of change in the consumption expenditure to the change in the disposable income
Formula	`APC=C/Y`	`MPC=(ΔC)/(ΔY)`