Microsoft is a monopoly. Even Mr. Gates acknowledged this point in testimony before this committee. He correctly indicated that the cost of computing has decreased 10 million-fold since 1971. Only a monopolist can elude the fundamental economics of the computer industry more functionality at a lower price. The second fact can be found in the profit margins Microsoft achieves through monopoly pricing.
Consumers pay through the lack of innovation and choice.
In market after market, we have seen what happens when Microsoft dominates. Pick a product. No new entrant, no innovation. No new entrant, no innovation. The same is true for spreadsheets, presentation graphics, and desktop databases.