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 people at the top of the tree are enjoying the best things in life
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% 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.
What they mean by wealth in this study is what people own, less what they owe - their debts. The assets include land, buildings, animals and financial assets.
The analysis shows, as have many other less comprehensive studies, striking divergences in wealth between countries.
Wealth is heavily concentrated in North America, Europe and some countries in the Asia Pacific region, such as Japan and Australia.
In richer nations, landowners can afford not to farm their properties
These countries account for 90% of household wealth.
The study also finds that inequality is sharper in wealth than in annual income.
And it uncovers some striking differences in the types of assets that dominate in different countries.
In less developed nations, land and farm assets are more important, reflecting the greater importance of agriculture in those economies.
In addition, the report says the weighting is the result of "immature" financial institutions, which make it much harder for people to have savings accounts or shares.
In contrast, some citizens of the rich countries have more debt than assets - making them, the report says, among the poorest in the world in terms of household wealth.
However, they are presumably better off in terms of what they consume than many people in developing countries.
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.
Many the world's poorer children will have very little to look forward to
Nonetheless, the authors say it is the most comprehensive study of personal wealth ever undertaken.
Why does it matter? Because wealth serves as insurance against times when income tends to fall, such as unemployment, sickness or old age.
It is also a source of finance for small businesses, a particularly important point since it is the countries with lower levels of personal wealth which also tend to have weaker financial systems without the funds, ability or inclination to lend to small firms.
The report is not about policy recommendations.
But one of the authors, Professor Anthony Shorrocks, says it does draw attention to the importance of enhancing banking systems in developing countries to help generate the funds for business investment.