Steps to bolster the economy have set off a stock buying frenzy. Our columnist spoke to Chinese investors about why they are jumping in knowing the risks. China, Economic Conditions and Trends, Stocks and Bonds, Alibaba Group Holding Ltd, Tencent Holdings Ltd, Politics and Government Steps to bolster the economy have set off a stock buying frenzy. Our columnist spoke to Chinese investors about why they are jumping in knowing the risks. NYT > Business