Money supply refers to the total stock of money of all types ( currency as well as demand deposits) held by the people of a country at a given point of time.
Money supply is measured in several ways which includes M1, M2, M3 and M4 measurement of money supply. M4 measurement of money supply is excluded from scheme of monetary aggregation in India as it is considered the most rigid money supply because it includes total deposits with post offices which takes more than 5 years to mature. Therefore, it is not considered a part of monetary aggregation in India.