Respuesta :
The answer is, "More people become literate".
When a set written language was set the common people were able to learn how to read and write- leading to them becoming more literate-, instead of it only being people of the upper class who knew the countries written language; keep in mind that in most Chinese Empires the language used for a lot of books was ancient Japanese. Once a set written language was set more people who were of a lower class had the ability to learn to read- even though a lot of them still didn't learn-
{I hope this helps a little!}