Every penny spent on a good or service must end up as​ someone's income so the total value of production in an economy equal the total value of​ income
The circular flow model describes how cash flows through society. Â Cash moves from yielders to workers as payments and runs back to yielders as cash for products. Â Since all the value created must refer to someone in the class of a request on the value, the national product is equivalent to national income.
Each action in an economy comprises a buyer and a seller. Households spend cash for acquiring goods and services exhibited. Firms make a production settlement. Households are employing units which incorporate output created in the business firms