Some grew strong enough to control commerce, suppress competition and manipulate prices.

The chief rule: Do not use market power to manipulate prices or take unfair advantage of competitors.

We simply choose this way to, um, manipulate the price of their product.

Farmers were then not allowed to manipulate prices by withholding their products to wait for price increases.

Federal investigators are trying to determine if the companies or their traders submitted the data to manipulate prices.

Immunize company officials who manipulate the price of stock by false statements.

"They were dealing with real companies, but manipulating prices of stock by illegal means in order for favored customers to make money."

Regardless of whether companies are manipulating prices, the California natural gas market is fattening bottom lines.

Sometimes those people's abilities to manipulate prices are astonishing.

Artificially manipulating the price of energy in this way would have an insignificant effect on oil dependency.