Some non-mainstream varieties, especially contracts in months with few traders, will still occur when the market fluctuates greatly.

Therefore, ordinary traders try to only make large and active varieties and try to only make main contracts.

But generally speaking, in the event of a major financial crisis, even the main contracts of large varieties may be directly closed, and it is not impossible to open the board for two or three consecutive times. However, there will be a three-board system, which will not make you lose money indefinitely, but it is definitely a big loss.