A sprawling shanty-town contrasts with high rise office buildings in the background in Makati, the financial district of Manila, in 2010. The United Nations on Thursday called for a tax on

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A sprawling shanty-town contrasts with high rise office buildings in the background in Makati, the financial district of Manila, in 2010. The United Nations on Thursday called for a tax on billionaires to help raise more than $400 billion a year for poor countries.

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