Any information on the Economy of the Mongol Empire?

http://en.wikipedia.org/wiki/Mongol_empi鈥?/a>|||As a starting point trade was booming between areas because of the unity and saftey between the Mongol empire (later 4 empires).





However, after the Mongol empire divided in 4 the economies of each empire tanked because the Mongols did not maintain the currencies of their regions. The best example of inflation and fallen currency is the Yuan dynasty (China) where they did not back the paper money with bullion and it became useless and the ilkhanate (Middle East).





Don't use wikipedia as a source.|||i am doin a project on it at school