[frandroid]

"Worth" is a product of accumulation over many years. GDP is a yearly measure. So you should compare Lemann's yearly income to per capita GDP.

Then once you start looking at individual incomes, you can look at the median income rather than the average income. Could be interesting to compare GDP per capita (which is an average) with the mean income, but I don't know if that's another apples to oranges.

As for number of hours worked, that's more a feature of the economic system and culture than wealth. We're so wealthy and so much is automatized compared to the middle ages that we could provide for everyone's basic needs with 15 hours of work a week or something, but we've decided that we need cars and cell phones and new clothes every year, and we've turned homes into investment vehicles, so we need to work more.