It provided free and safe travel across the Silk Road, it isolated Russia, and helped spread the bubonic plague
I believe the answer would be market economy
Answer:
research design
Explanation: Hope this Helps!
Answer:
The system of feudalism depended on weak ruler.
Explanation:
the dominant social system in medieval Europe, in which the nobility held lands from the Crown in exchange for military service, and vassals were in turn tenants of the nobles, while the peasants (villeins or serfs) were obliged to live on their lord's land and give him homage, labor, and a share of the produce, notionally in exchange for military protection.