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In page Nigeria:

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The threshold amounts used internationally by the IMF and the World Bank do not take into account the local purchasing power of a US dollar.[citation needed] The methodology is therefore not without controversy.[4][5] Despite the undoubted existence of slums in Nigeria, for example, the fact that 92% of men and 88% of women in Nigeria own a mobile phone[6] is difficult to reconcile with the poverty percentages published by the IMF and the World Bank.