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The richest 2 percent of adults in the world own more than half of all household wealth, according to a new study by a United Nations research institute. The report, from the World Institute for Development Economics Research at the UN University, says that the poorer half of the world's population own barely 1 percent of global wealth. There have of course been many studies of worldwide inequality. But what is new about this report, the authors say, is its coverage. It deals with all countries in the world - either actual data or estimates based on statistical analysis - and it deals with wealth, where most previous research has looked at income.