To increase the stamp duty to suppress the stock market, which is the rigid and stubborn thinking of some people . Especially the  "5.30" and "Banyejijiao" in 2007, and the stamp duty was raised from 1% to 3% and Leaded to the stock collapse, which make some regulators regonized the "power" to raise the stamp duty .Then increasing the stamp duty to suppress the stock market has become the "killer."
    In fact, regardless of whether the A-share market bubble or not, using a big stick to suppress the increase of stamp stock market is always inappropriate. States should not use the big stick to toss the stock market anylonger.