In most other ways, these companies transcend national boundaries. For example, many of them book a substantial portion of revenues through complex networks of "offshore" subsidiaries to avoid paying corporate taxes in any jurisdiction.[1]
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[1] For example, see http://www.nytimes.com/interactive/2012/04/28/business/Doubl...
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Edit: deleted reference to "Accenture," which is apparently legally domiciled in Ireland (thanks mschaef).