Economics has two major branches: (1) micro economics, and (2) both micro and macro economics theories. The parts of micro and macro economics that constitute managerial economics theories depend on the purpose of analysis. In general, the scope of managerial economics all those economic concept, theories and tools of analysis which can be used to analysis the business environment and to find solutions to practical business problems. In other terms, managerial economics is economics applied to the analysis of business problems and decision making. Generally, talking it is applied economics. The fields of business issues to which economic theories can be directly applied may be broadly divided into two categories: (a) operational or internal issues, and (b) environment or external issues.