Economics. Till recently , Economic was regarded as branch of Political Science. The Greeks called Economics by the name of Political Economy. Aristotle, in classifying the state, declared that the key fact is whether the state is ruled by the rich or the poo. He also observed that the way the bulk of the people earn their living, whether they are farmers, herdsmen, mechanics, shopkeepers, or day-labourers, will have much to do determining the nature of the State and its government. His discussion on revolution is also based on the proposition that the struggle between the rich and the poor is the underlying cause of most revolutions. Lock's Second Treatise of civil Government discusses topics that nowadays would be considered the province of Economics. Adam Smith, the English classical economist, in his famous book,An Inquiry into the Nature and Causes of the Wealth of Nations, refers to two important objects of Political Economy: to provide sufficient revenue for the people, and to supply the State, or what he calls commonwealth, with a revenue sufficient for public administration. Without clinching the matter, he summed up that political economy "proposes to enrich the people and the sovereign.