It has been accepted by the state, as well as the handling fees of exchanges and securities companies. These three are all big heads. Assuming that the stock market has 1000 billion, then through the above three channels, at least 300 billion yuan will be collected a year, leaving only 700 billion. Assuming that the average annual performance of listed companies in the stock market increases by 10%, it will only increase by 1000 billion every year. Finally, calculate.

10000+1000-3000 = 800 billion, which means that the money in the stock market will evaporate by 20% every year. Although funds keep entering the stock market, they can't stand this toss, so the stock market falls once every few years.

When the funds evaporated to a certain extent, the stock market crashed.