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US sues Apple for illegal monopoly over smartphones
(www.theverge.com)
This is a most excellent place for technology news and articles.
I think you could analyze it based on a company's history. Some companies clearly didn't earn a monopoly, for instance if they had a market handed to them by the government. Or, if they did the thing that's actually illegal under antitrust law - used a monopoly in one market to expand to another.