EVERY ten minutes, black Volkswagen shuttle vans ferry delegates from their hotels in Davos, Switzerland, to this year's World Economic Forum, held from January 17th to 20th. If you could squeeze the world's eight richest men into one of these vans, they might feel cramped. But they could comfort themselves with an extraordinary statistic: according to Oxfam, a charity, they own as much wealth ($426bn) as half the world's population combined ($409bn).
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