We say that someone who lives on less than $1.90 a day is extremely poor.
It’s the case of 800 million people in the world. They are mainly in Asia and Africa.
Very rich people are billionaires. There are about 1800 of them in the world.
Between them, they are richer than half the world’s population!
The richest man in the world is the American, Bill Gates, who founded the software company, Microsoft.