The property of related company make them have more interaction in market each other. In this paper，We research on the market value’s correlation of related company when the one company own the other company’s share. And we get the function between market value’s correlation and share. The result of our research as follow. Company A and company B are related company by that company B has owned the share of company A,It is possible that increase their market value’s correlation, also it is possible that decrease their market value’s correlation, which influenced by the market value’s correlation when they are not related companys.
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