Why was there a high rate of illiteracy among slaves?

Their "owners" didn't believe that literacy was an important skill for people who were just going to do physical work, and that it would be pointless and a waste to teach them to read. Also, leaving their slaves illiterate put the "owners" at an advantage. They wouldn't know if you lied to them about what something that was written said, like a law.

Do you have more info about it ? i doubt this is the answer because i don't have all the information but if trouble was brewing in a clinic maybe it was an argument as to which clinic was better or smth of that nature