Six firms - GM,Ford,Chrysler,Toyota,Honda,and Nissan - share 90 percent of all U.S.auto sales.Hence the U.S.auto market can be regarded as a monopoly.

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The U.S. auto market cannot be regarded as a monopoly because there are six firms competing with each other for market share. A monopoly would consist of a single firm with complete control over the market.

Six Firms - GM,Ford,Chrysler,Toyota,Honda,and Nissan - Share 90 Percent of All