How did the Mongol administration facilitate the growth of commerce?

It's a similar question as your last, mongols facilitated contact with west Asia and Europe contributing to the beginning of "global history". Mongols favored trade their nomadic way made them see the importance of it, unlike Chinese who thought to be disdainful to trade and saw merchants as parasitical that did not produce any good, mongols had a very positive toward traders and commerce even facilitated international trade. Mongols increases the amount of paper money in China and guaranteed value of paper in precious metals.