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.The last time public opinion and major newspapers in the country were not consuming less paper ink waste discharge about toxic substances which cause serious pollution to the natural environment of the factories in the country. According to statistics of the Ministry of natural resources and the environment, then each 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.Reality that the authorities have many times to consider, should maintain those plants that each year gives the source of national budgets hundreds of billions that or should retain for the country a natural ecological environment, clean and 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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