What is the activity monopoly mechanism?

Refers to a few large capitalist enterprises, in order to obtain high profits, through mutual agreement or alliance, manipulate and control the production, sales and prices of commodities in one or several departments.

Monopoly mechanism, also known as automatic stop mechanism, refers to the measures taken by the exchange to suspend trading to control risks when the stock index fluctuation reaches the prescribed fuse point.

Specifically, the US Stock Research Institute is a mechanism to set the fuse price for the contract before it reaches the price limit, so that the contract trading quotation can only be traded within this price range for a period of time. Briefly talk about the fuse mechanism of American stock market.

Market decline: refers to the decline of the index point of the S&P 500 index during normal trading hours relative to the closing point of the previous day. Generally speaking. The melting of the primary market means that the market has fallen by 7%; The secondary market fuse means that the market is down13%; The melting of the tertiary market means that the market has fallen by 20%.

In addition, it should be noted that the suspension of the whole market transaction based on the primary market fuse and the secondary market fuse is triggered only once a day. For example, if the price falls to 7%, it will cause the primary market to fuse, and then the price will rebound. When the price drops to 7% again, it will not fuse again, unless the price drop triggers the secondary market to fuse.

When the tertiary market is blown at any trading time all day, the whole market will stop trading until the opening of the next trading day.