In this article I will mention one in ten principles of economics. The principle that I will mention in this article is the first of the ten principles the basic principles of Economics, that's the trade-off.In the past, public opinion and the major newspapers in the country have so many expensive cartridge paper, to write about the discharge of toxic substances waste polluting the natural environment seriously, of large factories in the country. According to statistics of the Ministry of natural resources and the environment, every year there are hundreds of tons of dust, smoke and other harmful substances discharged from large companies, that have serious impacts to the natural ecological environment and the health of people living close to these big companies.Before that situation, the authorities have many times to consider, should maintain the plants, which each year gives the source of national budgets hundreds of billions or should retain for the country a natural ecological environment, clean, and the people will have a more clean air environment. The decision between the two considerations, should retain the big companies or a natural eco-environment of the authorities was to see the trade-off between the choice of decision makers.
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