The Databook has a table (Table 2-4) giving estimated median wealth per adult for all the world's countries (or something like all; I haven't checked). Many of the figures are small, but not one is negative. I'm fairly sure these figures are net of debt, but it's not 100% clear. So, just in case, compare those figures with the ones in the previous column, listing debt per adult; the only countries where the debt figure exceeds the wealth figures are (unless I missed some) Brazil, Cyprus, Denmark, Germany (!), Malaysia, Maldives, Sweden, the US.
(I believe from other sources that US median net wealth is comfortably positive, which is one reason why I am pretty sure the figures in the "median wealth" column of Table 2-4 are net of debt.)
Half of all adults own < USD $2,200.
The bottom 20% (something like 1 billion adults today) own < USD $248.
Inequality is increasing - the top 1% own almost 51% of global assets.
These statistics show that most humans have very little accumulated wealth to control, and very few humans have a lot of the total global wealth.
