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Calls for a wealth tax are getting louder because of a growing gap between the ultra-rich and the not-so-rich. Oxfam International released a report ahead of the World Economic Forum that says the world’s 2,153 billionaires have more wealth combined than 60% of the global population. That’s about 4.6 billion people. The global anti-poverty organization also says the wealth gap has a much greater impact on women than it does men.