are cleaning businesses profitable Not only can consumers have more choices in the price, variety and service of commodities, but also make it better for enterprises to purchase production factors and sales products. 6. The accounting benefit is bound by the prudent principle. According to the principle of prudence, when there are a variety of accounting methods to choose from an economic business of an enterprise, it should choose a method that neither overestimates nor depreciates the benefits. Enterprises manipulate profits to achieve homogenization of profits, most of which adopt the method of overestimating earnings, and the subjective selection of the period of value-added. 3. The role of securities investment We are in an era of economic, political, technological, social change and development. In this era, change and development bring both opportunities and risks to people, especially in the competition for market, resources and spheres of influence. If managers in seize opportunities and take advantage of opportunities at the same time, and to minimize risk, that is on the way forward towards the goals set up a bridge of convenient and secure, so organizations can be in an impregnable position, in the opportunities and risks of the vertical and horizontal choice, get survival and development. If you don't plan, or have no plans at all, you'll have disastrous consequences. The market is the condition that Commodity Exchange is carried out smoothly, it is commodity circulation domain all Commodity Exchange activity total. The market system is made up of all kinds of professional market, such as goods and services market, financial market, labor market, technology market, information market, the real estate market, cultural market, a complete system of tourism market, etc. At the same time, each professional market in the market system has its special functions, which are interdependent and mutually restricted, and work together in the social economy.