Over 90% of the world’s population lived in extreme poverty just 200 years ago. That percentage is currently less than 10%. That’s because the world’s income tripled between 1820 and 1900. It tripled again 50 years later, and a third time by 1984.
Even less wealthy and developed nations today, like El Salvador or Rwanda, double their income every 18 years. More affluent nations do so every 35 years.