When your order was filled Be sure the items on your confirmation match the instructions you indicated in your trade. In the event that some part of your order is not executed the way you expected, call Ameritrade to reconcile your order. Fast Markets Fast markets occur when more orders enter a trading area than the brokers and specialists can handle effectively. These situations are often created by the announcement of unexpected news. The news can be about anything, but quite often it is the announcement of takeovers or of surprise earnings.
Fast markets can occur as the stock moves up or down.
In a fast market, even the real-time quote you are looking at online may have already changed dramatically. Like anything that moves at a high velocity, fast markets can be dangerous. In such a situation you should proceed carefully, if at all. How to protect yourself in a fast market. The only surefire way to protect yourself in a fast market is to stay out of it.