BBC News
By Andrew Walker
Economics correspondent, BBC World Service
The richest 2% 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 of Development Economics Research at the UN University, says that the poorer half of the world's population own barely 1% of global wealth.
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Wealth is heavily concentrated in North America, Europe and some countries in the Asia Pacific region, such as Japan and Australia.
These countries account for 90% of household wealth.
The study also finds that inequality is sharper in wealth than in annual income.
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The survey is based on data for the year 2000. The authors say a more recent year would have involved more gaps in the data. As it is, many figures - especially for developing countries - have had to be estimated.
Nonetheless, the authors say it is the most comprehensive study of personal wealth ever undertaken.