The research focus on the approaches used  on measuring and  estimating national income  of a nation. National income is the money value of the end result of all economic activities of a nation. Economic activities generate a large number of goods and services, and make a net addition to the national stock of capital. These together constitute the national income of a closed economy, I.e an economy which has no economic transaction with the rest of the world. In an open economy, national income includes also the net results of a nations transaction with the rest of the world (I.e export less imports). National income is alternatively called national products.  Incomes are earned by producing goods and services. This value of products represents incomes to producers in the form of wages, salaries, rent, interest, or profits.  Thus the total of all incomes must be exactly identical with the value of all goods and services produced in an economy within the particular year.

Estimating, National

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