摘要：Any investment project requires an economic analysis. The main role of economic analysis is to design and select the projects that contribute to the welfare of a region or a country. Economic analysis is most useful when used early in the project cycle, for identify bad projects and bad projects components. If economic analysis is used at the end of the project cycle, it can only help in the decision of whether or not to proceed with a project. Economic analysis differs from financial analysis which evaluate a project only from the point of view of the owner of the investment. Economic analysis includes all social and environmental costs which were not taken into account by financial analysis. Transforming the market prices used in the financial analysis into accounting prices is achieved by using conversion factors affecting corrections costs or benefits as taxes or subsidies
