The scarcity of resources forced the nomadic tribes (the Mongols) to depend on the other neighbouring countries for the essential goods for trade. Their trade was based on barter system, which was beneficial for both parties engaged in trade. They imported agricultural products and made implements from China and in line of these they used to export horses, fur and animals used for hunting. The nomadic people used to suffer less as compared to their opponents. The possible reason behind that was the nomadic people quickly disappeared from the place of their strife after carrying out loot and plunder. It meant several losses for trading partner, i.e. China. In order to safeguard their people from Mongol strifes, the ruler of China constructed the 'Great Wall of China'.