The aim of this study is to investigate how network effects affect the quality and price decisions of firms in a vertically differentiated market. As network effects increase, high-quality producers tend to raise quality while low-quality producers lower it. The degree of product differentiation...

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English Abstract: The conception of global macroeconomic spherical model is a three-dimensional space model, which is proposed under the integration of global economy and the globalization of network. In view of the financial crisis in USA in 2008, the output of its crisis has been changed into...