“…SNA 1993 describes that as a key aggregate it measures production, and it is widely used by analysts, politicians, the press, business community and the public at large as an indicator of the economy. According to Carson (1996) it can be derived according to three approaches -the demand approach, which is the sum of the expenditure by final users, the production approach, which is some of the value added and the income approach, which is the sum of the primary income of residents.…”