Who propounded the theory of the circular flow?

What country of Africa is a member of OPEC? Why were monopolies able to charge very high prices for their products? What does human povert index? Is the bailout really a bailout? In a free-market system producers are most strongly driven by what? How much was the average home in 1920? What does curve the needle mean? What pair of lines uses a leading approach as opposed to a leaping approach? Why was the two dollar bill minted? How research responds to the economic recovery and austerity measure of the country? What does One million joules equal? In which type of economy would prices be set by the government? What is exmple of temporocentrism? Why does the federal reserve act as a financial regulator? What is ceteris paribus? When firms collude on price they also often have to agree on? What are the advantages and disadvantage's of young people learning a trade from their father? How much can you sell 2 dollars Jefferson of 1976? How many bushels of rice are in a barrel of rice? Is scarcity an ongoing condition?