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That eBay is going to conduct business across national lines, that is a given. The broader question is, eBay's headquarters will operate under whose laws centrally: the U.S.', or that of a global government?
Can eBay drive a PowerSeller out of business unfairly, or if it can't ... when it becomes subject to monopoly and antitrust law, who will judge them? The U.S. Congress or a global entity?
We will all CONDUCT ourselves in more and more global ways, in many arenas. The OVERSIGHT is what is at issue. To whom will U.S. business interests answer, to the U.S. or to a United Nations overseeing body?