These statistics on the left were published in The Economist in 2014. Their source was the bank Credit Suisse. They illustrate a shocking fact: 0.7% of the adult world population owns 44% of the wealth in the world and 7.9% owns 41+%. This means that less than 10% owns 85+% of all the wealth.
To put it another way: 70% of the adult world population owns 3%. Today [2021] these figures do not differ substantially; if they do, they are even worse. In the past 40 – 50 years inequality has increased between countries. But also within societies. Which has led to many forms of social problems and growing social unrest.