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To: david1951 who wrote (190400)5/11/2016 3:02:38 PM
From: Art Bechhoefer  Read Replies (1) | Respond to of 213177
 
Of course, someone could have hit the wrong numbers on a keyboard. But securities laws require that if you place an order at market, the broker is obligated to get you the best price. If you place a limit order, and the stock drops below the limit price before the order is entered, you get the lower price. The same applies when you sell a stock; namely, that the broker is obligated to get you the best price available at the time the order is entered.

In recent years, there have been cases of front running, where traders or brokers receiving client orders buy or sell on their own behalf, before acting for the client. This is a no-no, and brokers have been prosecuted for such actions.

Art