Theoretically speaking, futures varieties are not easy to be manipulated compared with stocks, mainly for two reasons. First, there is no specific position limit (share capital) for futures varieties, but the share capital of stocks is fixed (once a stock is in circulation, it will not change unless it is issued), and the fixed share capital brings the premise for operation. By calculating how much can be controlled, the difference between futures and stocks is similar to the difference between open-end funds and closed-end funds. Second, futures varieties are linked in the world, and although stocks are also influenced by the international market, the scope of linkage is obviously smaller than futures. Domestic futures reflect international trends, while stocks only reflect the situation of a certain industry or enterprise, so even if domestic bookmakers can control domestic futures varieties, they can't control global varieties, so even if they do, the control time is very short.