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US sues Apple for illegal monopoly over smartphones
(www.theverge.com)
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By this same logic, on a global scale they are not dominant, so they can be argued to be a worse product, not superior. Therefore, their dominance on the US must be forced by coercive actions and categorized as a monopoly.
Their actions in the US market and tastes of US customers are not necessarily the same as elsewhere in the world. If Apple concentrated marketing in the US, for example, that would be sufficient.