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註釋All researchers in the world have focused on how to solve recent economic problems in order to improve quality of our lives as well as wealth. To improve the quality of people's lives, as an economist, we need to investigate economic issues deeply to understand how these problems occur in the current economic system. These investigations may lead to solutions to overcome many economic problems. During this investigation, one of the most important impediments that prevents analyst to make a comprehensive analysis is the fact that economics has multi-dimensional and multi-disciplinary charateristics.