Pairing means two accounts make orders in opposite directions, losing money from one account to another account. There are many purposes, such as bribery, money laundering, or it seems that you can earn commissions. That is to say, brushing orders, but this is very risky, and this is illegal behavior and the exchange will strictly monitor it

For example, if a Wall Street company wants to manipulate oil prices, it can buy and sell oil futures on its own. , or do short-selling, and buy call and put options at the same time to generate a large amount of trading volume. At this time, many retail investors follow up to buy or sell, which will drive changes in futures prices or stock prices. The real internal cause of short-term changes in futures and stock prices is not the relationship between market supply and demand, but the buying and selling in the market. The more people buy, the stock price goes up, and the more people sell, the stock price goes down.