"We don't want a rate that's subject to market manipulation."

True, it was always hard to pin down specific acts of market manipulation.

The development is a significant turning point in the investigation, as investigators branch out into examining possible market manipulation.

But he has previously been investigated in connection with possible market manipulation.

Then as now, a thin line separated genuine economic enthusiasm from market manipulation.

Do some funds, when they know what regulators are looking for, then try other forms of market manipulation?

"I think there is some real market manipulation going on here," said one government securities trader, who asked not to be identified.

As a result of the market manipulation during this deregulation, California paid a huge amount for electricity.

The bigger story involves market manipulation by a number of producers.

Still, the agreement does not mean overnight changes and freedom for investors from the risk of market manipulation.