ebit profit margin As hicks income concept did not specify what is called "equal wealth", and thus the income concept formed the basis of many debates concept, and the theory of accounting earnings, especially the capital preservation theory has a great influence. In accounting, people used to call "maintaining the same level of affluence" as capital preservation. Giant in the core technology to set up in zhejiang Quzhou City, mainly through the investment or acquisition electronic chemical materials realize the endogenous development of industry and through the integration of domestic and foreign excellent electronic materials enterprises implement denotation expansion. In the establishment of giant core technology help the company to seize electronic chemical material industry development opportunities and gather the development resources, accelerate the process of product localization and industry overtaking corners, and achieve the transformation and upgrading of the enterprise and the sustainable development, realize sustainable return on investment. Positive economic profit is sometimes described as excess profit. Interest rates have a very important impact on the exchange rate, which is the most important factor affecting the exchange rate. We know that the exchange rate is the relative price between the two countries' currencies. Like other commodity pricing mechanisms, it is determined by the supply and demand relationship in the foreign exchange market. Foreign exchange is a kind of financial asset, which people hold because it can bring the benefits of capital. Historically, the concept of income has first appeared in economics. Adam Smith, in the wealth of nations, defined income as "the amount of consumption that is not eroded by capital", and saw it as an increase in wealth. Later, most economists inherited and developed this view. 1890, ai (Alfred Marshall Maarshell) in its "the principles of economics," the Adam Smith's "wealth increase" enterprise, introduced the concept of earnings, is proposed to distinguish the entity capital and value-added benefits of economic benefits.