Yep because archaeologists found it
The southern gentry usually educated their children by "hiring private tutors", mostly due to the fact that the population density in this region was low, and sending children to single schools was impractical.
(A) Gross Domestic Product (GDP) is your answer.
The GDP takes all the profit a country earns through export, and subtracts it from the imports that the country takes in (To see if there is a profit). It is then divided by the amount of people that lives inside the country, so that they can find the GDP per capita (How much each person is given if all the money is split evenly.) For example, the GDP per capita for the US is almost $60,000.
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