Poor societies in general mostly in developing countries.

Yeah at the end of the book he said on average most people live on $0.99 cents a day if we can get to an inflation adjusted $5 a day in the next 50 or 100 years that would be a massive improvement.

Back in 1000 I wonder what people lived on per day? Probably a lot less than $0.99 a day (adjusted for inflation of course)