Knights were indeed lower than vassals and held less prestige in medieval society. It's not true though, that knights didn't have enough prestige in medieval society. Vassals swore to the king or the ruler of a region, whereas knights often swore to vassals, so they still had people under them, but they were not at the top.
I believe it was because both blacks and whites were moving west to the cities to find jobs.
hope i helped :)
Answer:
I'd say a command economy.
Explanation:
I know a command economy tells people what to buy.
I may be wrong, if I am, I'm so sorry!
Chief Justice John Marshall
Social discord, political instability and lack of compromise, economic collapse.