Us stock research institutions pointed out that the us stock market implements the T+3 delivery system, that is, the settlement and delivery are completed on the third working day after the transaction.
The fuse mechanism of US stocks can be divided into three levels during trading hours in the United States.
The primary market fuse refers to the market falling to 7%;
The secondary market fuse refers to the market falling to13%;
The third-level market fuse means that the market falls to 20%.
During non-US trading hours, a 5% increase or decrease in the price of stock index futures will trigger the fuse mechanism.