In this article I will mention one of the ten principles of economics. The principle that I will mention in this article is the first principle of the ten basic principles of economics, there is a tradeoff. In recent years, public opinion and the major newspapers in the country were costly a lot of paper and ink, to write about the discharge of harmful substances seriously polluting the natural environment, the major domestic plants. According to statistics from the ministry of natural resources and the environment, each year hundreds of tons of dust and other toxic substances are emitted from large companies, it has a serious impact on the environment and natural ecological health health of people living close to such big companies. Facing this situation, the authorities have repeatedly considered, whether to maintain the plant, which annually bring national budgets hundreds billion or nation should retain a natural ecological environment, clean, and the people will have a clean air environment more. Balance between the two decisions, should retain large companies or a natural ecological environment of the authorities have shown to be a tradeoff between the selection of decision makers.
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