The internet search engine market is now moving towards a duopoly. Look at the current market shares for each company:

Google 58.4%
Yahoo 22.9%
Microsoft 9.8%
AOL 4.6%
Ask 4.3%

Ask have announced that they are no longer going to compete against Google and Yahoo, and if Microsoft buys Yahoo, then the market will be pretty much a duopoly (AOL has a tiny market share).

Can you name any more examples of a duopoly?


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