How the gdp of primary sector is calculated?

1.	How the gdp of primary sector is calculated?
Answer» GDP can be calculated by using three methods—the supply or production method, the income method and the demand or expenditure method and by definition the value of GDP should be identical, irrespective of the method used. This is because one person\'s or entity\'s income is another person\'s spending on expenditure. For instance, what households spend in buying provisions at a local store is the shop owner\'s income. Likewise, an employee\'s salary is what his/her company spends.

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