What data do economists use to calculate the real gdp of a nation?

Market value and price level

Price level is the normal of current costs over the whole range of products and ventures created in the economy. In a more broad sense, value level alludes to any static photo of the cost of a given decent, benefit or tradable security.

The value an advantage would bring in the commercial center. It is likewise regularly used to allude to the market capitalization of a traded on an open market organization, and is acquired by duplicating the quantity of its exceptional offers by the present offer cost.