This is not controlled by the exchange, but by some large funds. For example, the fiberboard listed on 20 13 fell to 47.5 when FB 1405 fell, and no one took it, but it rose to 67 when it rose, and no one dared to sell it. Why? Because it was the spot seller who shorted at the beginning, for these small varieties, after you received the goods, you must finally sell them back at a lower price; When it goes up, these people still do more. Why does no one dare to be free? Because the spot dealer is an opponent, after emptying, the spot dealer will not supply you, but will only be forced to open a position. Look at the current FB 1409, short-selling retail investors trample on each other and rush to flee; At that time, on FB 1405, it was a multi-head small-scale competition, and whoever ran fast stopped.

For such a compulsory market, the price itself is manipulated. In order to find the opponent's position, such as keeping the price at an "unreasonable" level, people who saw the opportunity poured in one after another, and finally let the price go in a "more unreasonable" direction, and the position remained high. Why? It is because many people are not satisfied with their hearts and their eyes are full of tears.