Modern weapons are often so complex that there are only two or three competent suppliers for any given system, and once a major award is won, the company that prevails becomes a monopoly supplier of the system in question.

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These agencies will question not only his effective monopoly of the satellite television business, but his putative ability to influence the success of news and entertainment networks through his ability to distribute programming to millions of subscribers.

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In his written testimony, Mr Schmalensee is at pains to insist that the Justice Department's case against Microsoft does not turn on the question whether the firm is a monopoly in the operating-systems market.

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The MPs also question the adequacy of having "a monopoly supplier business model in police procurement" and note that the new official Taser supplier consists of "more or less identical personnel operating in the same premises with a near-duplicate website" as the former distributor.

BBC: Taser contract criticised by Home Affairs Committee MPs