Stock -The economic variables that are measured at a particular point of time are called stock variables. Stock is static concept. It has no time dimensions. E.g. bank balance as on 1st Oct 2011 is Rs 5000.
Flow-The economic variables that are measured during a period of time are called flow variables. Flow is a dynamic concept. It has time dimensions. E.g. Interest earned on bank deposits for 1 year, i.e. from 1st April 2011 to 31st March 2012.
