WELCOME I  heartily welcome you to read about the various factors which are responsible to save income and to determine the level of aggregate consumption. It is Macro Economics so, all the concepts are considered as aggregate (Total) values.  Consumption function The concept of consumption function is introduced by J.M Keynes a British economist. That's why it is also called as "Keynesian consumption function". according to Keynes it is useful to find out the aggregate values of consumption and expenditure in an economy and to predict based on available data.  Consumption function refers to the functional relationship between total consumption and the total national income when other things remains constant. This can be expressed as a mathematical formula: C = f(Y) where C refers to the total consumption. f refers to the functional relationship  Y refers to the income or disposable income. classification of determinant factors J.M Keynes classified the determinants of co