Regulation Effects on Stock Returns in Shanghai and Shenzhen Exchanges
We compare changes of mean and variance of returns as two regulations have changed between 1992 and 2007 in the Chinese exchanges of Shanghai and Shenzhen. Specifically, we compare the implementation of a ±10% daily return limit vs. the absence of any limit, and the effect of allowing local and foreign investors to invest in both type-A and type-B stocks, vs. an earlier regimen of clear-cut segmentation. We find that while imposing the ±10% limit significantly reduced total daily variability, it increased the variability of opening returns in Shenzhen. Mean returns at the opening and throughout the trading session changed after the clienteles were merged, but not the total daily return, thereby improving market efficiency.
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Volume (Year): 30 (2010)
Issue (Month): ()
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