This story shows where integrity and greed, the good and the bad are present at all times in the market. Let's take trader A who follows the cardinal rules of trading. He holds an order to buy say $10 million of US treasuries. He knows that such an order will most likely drive the price up. He places his client's order first, then decides to piggy back him and places a trade for his own account after his client's trade is completed.
Trader B holds a similar order from a client to buy $10 million of US treasuries. But unlike trader A, he places an order for his own account first. So he already is in the market. After his trade is completed, he places his client's order which he believes will drive up the price. This practice is called "front running.
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