There is no price limit for US stocks. If the price rises or falls by more than 10% within10 minute, the trading will be suspended for 5 minutes, and the price can continue to rise or fall after 5 minutes.

For example, the shares of BGCP rose by more than 40% at the opening today. There will be screenshots later.

Us stocks can be short. On that day, the stock fell by 10%. On the same day and the next day, stocks can't be shorted directly, so they can only hang the list on it and wait for passive trading.

Us stocks adopt T+0 trading mechanism. You can buy and sell freely that day.

Us stocks cannot be leveraged.

Every American stock has a market maker. Electronic transaction, the actual transaction is full of a large number of electronic bills.

There are many stocks in the U.S. stock market with little trading volume that day, and almost no one participates.

There are many characteristics, I don't know which one you want to ask. Answer these first.