Is the same as national product (NP) what is earned as income is only the monetary value of what has been produced so that whatever the society produces determines the national product (NP) or national income (NP)

The effect of depreciation (loss of value in capital equipment).This has to be put under consideration Economist are interested in the sustained materials wellbeing of the people.

Capital consumption allowance which is necessary to maintain economic activities in the economy has to be put under consideration.

For accurate results GNP accurating goods should be counted once double counting should be avoided National income can estimated either at market puce (MP) or at factor cost (FC)