Agree with the first floor and disagree with the third floor. Futures originally only stopped trading at 4%-6%. If you think that 7% is the Dayang line, there is almost no Dayang line.

In my opinion, the ocean and Yin Da are relative and should be determined according to different periods and varieties.

If we have to set a standard, the variety with large fluctuation can be set as 3%, and the variety with small fluctuation can be set as 1% or 2%.