Answer:
Chinese historians have spent well over a thousand years trying to understand why the Han Dynasty collapsed. Over time they developed three main theories: 1) bad rulers; 2) the influence of empresses and court eunuchs over child emperors too young to rule by themselves; and 3) the Yellow Turban Revolt.
Explanation:
Marco Polo traveled during the middle ages (AP period 3), for this the communication technology was not very advanced and Western Europe didn't really know the situation of East Asia and vice versa. When Marco Polo explained his travels to the Europeans of the greatness of China many Europeans decided to go and see for themselves if this greatness was indeed true. When the Europeans arrived in China they were very impressed and a new promotion of travel to China emerged, INCREASING China's economy.