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Until recently representatives of economics specialized in examining microeconomic and macroeconomic problems. In the 20th century new areas of analysis, appointed by locating objects which they concern turned up at the economic system as a whole taken hold. At least at present a trial attempt is filling the leading part still widely comprehended systemizm let for distinguishing levels of economical analysis. Situating chains of supplies on the appropriate level of economical analysis is an important problem.
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