January 2009 - March 2012 CPI on the stock market are analyzed, the following conclusions: the cointegration relationship between the CPI and the Shanghai Composite Index and Shenzhen component index stable, but the CPI is not a stock index Grangerreasons; China's stock market is a very short time before the release of the CPI information, stock prices fluctuate significantly, the yield showed a significant abnormal return characteristics, which indicates that China's stock market validity.
Asymmetric information between the investment entities, there may be leakage problems before the release of important economic information. Then a simple analysis of the CPI increase month and CPI to reduce the monthly stock market rate of return before the release of the CPI changes derived CPI period is 5 days, the volatility of the CPI rate of return is 0.025.
Keywords CPI 、The Shanghai Composite Index 、Shenzhen composition index、Cointegration Analysis 、Cointegration Analysis、 Stock market rate of return、Event study methodology
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