For most of human history, economic growth was small or non-existent. Then the Industrial Revolution happened and everything changed.
GDP per capita in 2019 U.S. dollars. Purchasing Power Parity method.
Source for historical data here.
Source for 2019 data: IMF estimates.
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Data is on a log scale.
I converted the numbers in the historical source from 1990 dollars to 2019 dollars.
Max Weber's classic "The Protestant Ethic and the Spirit of Capitalism" suggests that this was due to changing moral values, especially the Protestant "work ethic".
Another explanation might be that, in Catholic societies, a large percentage of property was owned by the church and a large number of people were monks and nuns who spent countless hours on "unproductive" tasks such as praying for the souls of the deceased.
Edited: ok, it's per capita using the PPP. I guess most of the Chinese population have always been extremely poor.