Answer:
A free good is a good that is not scarce, and therefore is available without limit. A free good is available in as great a quantity as desired with zero opportunity cost to society. A good that is made available at zero price is not necessarily a free good.
Explanation:
Civilization in China began at the Yellow River Valley.
Answer:
Mongol leader Genghis Khan,
After uniting the nomadic tribes of the Mongolian plateau, he conquered huge chunks of central Asia and China.
