The circular flow model which is also referred to as the circular flow of income simply shows how money flows or changes hand between the household and the firms.
For example, the individuals purchases goods from the firm's and the firms pay individuals which are the workers wages and salaries. Money moves through different ways in the economy.
In the 16th and 17th centuries, Portugese traders enslaved Africans to work in the Portuguese colony of Brazil, over 350,000 Africans were to be slaves in America.
