Business Administration Dept, Faculty of Management and Accounting, Shahid Beheshti University, Tehran, Iran
Abstract
Economics usually divided into two theories: microeconomics and macroeconomics. The theory of microeconomics deals with the individual behavior of individuals and firms. Macroeconomic theory is concerned with the behavior of the whole of individuals and firms, so they analyze by looking at the whole economy based on the sections of households, firms, government and international as well as general equilibrium. "Financial economics" now applies to both branches of economics, but microeconomic theory is more relevant. From this perspective, the financial economy usually studies, analyzes, and analyzes a variety of investor decisions about credit resources and the allocation of internal and external resources of firms in the short and long run. In the short term, the investor may be interested in estimating the relationship of demand, opportunity and return so that it can decide on pricing for capital stock and the amount of its supply. From the perspective of microeconomics, cost and supply theories of capital examine, which clearly influence the decision-making of individuals and firms. Macroeconomic theory, of course, comes into play when the investor seeks to predict future opportunities and threats based on factors affecting the overall economy.