"Even as China's stock markets rebound after a brutal selloff, they are behaving like no other markets in the world. Taken together, China's two stock markets rank second in the world in market capitalization behind the New York Stock Exchange, and in the top 10 in terms of number of listed companies. Despite their size, China's markets trade like the wildest emerging markets with huge volatility, big boom and bust cycles driven by fast-trading individual investors and heavy involvement from the government. Unlike every other major stock market in the world, China's markets are almost completely closed to foreign investors," the Wall Street Journal reports.