And the options exchanges, which have been effective monopolies for decades, must open their doors to true competition, he said.

The decision gave Topps an effective monopoly of the baseball card market.

Under the government plan, each of the two companies would have an effective monopoly.

For the freebie market to be successful the company must have an effective monopoly on the corresponding goods.

These functioned as effective monopolies for a particular good or labor.

The company's effective monopoly on trade virtually forbade any settlement in the region.

Their carrier enjoy effective monopolies, so they don't have to conform to standards.

This results in an effective monopoly that provides the largest source of the agency's revenues.

The Authority has an effective monopoly on car ferry service, but private companies operate various passenger routes.

I am not happy at the thought of the Ballroom having an effective monopoly over control of the military.