Roman plebeians moved to the country side to pay less taxes and to have better lives.
Explanation:
In the later times of the Roman rule, the plebeians had seen that their condition had been in a steady decline.
-They were the ones paying most of the taxes
-they had the least rights in the nation.
-They had no representation from the state itself.
This made their positions terrible in the city so they simply chose to move out when they could which was rare and settle in the country side as serfs which was a better and more free life for them than this was.
They had more rights and less expenses there to live compared to the city of Rome.