Koch Industries' mysterious 'internal bank' in Switzerland | Guardian Explainers

The Koch brothers are renowned for their libertarian views, their political funding and influence, and their privately-owned global business empire.
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But you've probably never heard of Arteva Europe, whose Swiss branch makes hundreds of millions of dollars in interest income, pays very little tax, and – mysteriously – has no staffing costs. We go to Zurich to find out what happens at this lucrative office.
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