Three types of macroeconomics :

1) Macro statics

It explains the total elements of the economy and their relation to the equilibrium state of the whole economy at a particular point in time. In other words, macro static economy explains the static equilibrium position of the economy.

The following equation reflects the final position of equilibrium:

Y = C + I where, Y = aggregate income

C = aggregate consumption and

I = aggregate investment

2) Comparative macro statics

Comparative macro statics is concerned with the comparative study of different equilibrium positions attained in an economy resulted by macro variables. It is concerned with the comparison of two or more successive equilibrium positions. But it tells nothing about how the system moves from one position to another.

3) Macro dynamics

Macro dynamics analyses the process by which the economy moves from one equilibrium point to another as a result of the change in macroeconomic variables. It explains the each and every step of change involved in attaining new macroeconomic equilibrium point. Macro dynamics studies all the changes, changing path, the equilibrium position of an economy before and after the change.