>>397795The actual definition of "wealth" in the economic sense and not its pop usage is income + assets minus debt.
Many multimillionaires and billionaires have either long term or temporarily more debt than they do income and assets (ie property, stockmarket shares/bonds, physical assets) often for long periods of time, so while these people may live in mansions, have private jets and access to enormous amounts of spending money they technically have negative wealth.
In fact, the ability to have negative wealth is a sign of a "privileged" class background as the majority of proles globally do not have access to financial services or banks, money borrowing which does occur often exists on an informal or non-legally binding basis from richer members of the community/family and is not calculable for that reason.
So ie, a New Dehli bigger or landless peasant in Peru might literally own the clothes on their back, but even without valueing them having net 0 wealth renders them far wealthier than a billionaire with -100 million $USD wealth.
If it sounds fucky and dishonest, that's because it is. Almost all statistics and official figures on economics coming out of bourgeois states are similarly fucky, ie inflation, PPP calculations, poverty reduction rates, unemployment, etc.
As to why oxfam & others lie this way, it's because intentionally misrepresented & fudged stats and intentionally misleading graphis like this create catchy headlines which lead to both more donations and also government funding for them and similar NGO's.