Enron, among other creative schemes, was manipulating energy markets to their advantage and the disadvantage of the State of California. Now really high speed trading brings such activity front and center.
Read about Optiver, a Netherlands based trading operation. Goldman Sachs is also participating in such activity. Front running is the process of entering your order before the client's to obtain a better pricing, knowing what the market price is. High speed computers have brought this practice to the mili second of time.
Expect such activity to draw the attention of an outraged public the next time a melt down occurs.
Professor Elam 
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