If you lower your management level like that, many people will explode and you will be censored. Taking the continuous down limit as an example, it shows that the market price needs to fall continuously, and the range of 4% can't meet the needs of the market. Obviously, it needs to be expanded to increase the margin and expand the fluctuation range. Once you adjust the price below 3%, the market may fall as soon as it opens, and most of the time it will be firmly pressed to the limit, which is the so-called infinite limit. As a result, many investors can't even close their positions and watch their money get less and less until they explode. In 2008, there was such a time that copper futures went up 12 in a row, and all of them went up indefinitely. At that time, it was not only the explosion of positions, but also the infiltration of positions everywhere.