The correct answer to this open question is the following.
Although there are no options attached we can comment on the following.
The Mongols had to overcome trade restrictions due to the mountainous region in which they lived by facilitating in any way possible the access to merchants to its regions and by getting out of its territory to offer their goods in other places and trade them.
Mongol people favored trade because it was the most important activity to genera income. Trade was a central part of the Mongol economy. Let's remember that Mongols did not really settle in one place at all. They were nomads that enjoyed waging war, following herds and hunt them.
For instance, Genghis Khan supported traders from abroad because Mongols needed different supplies to make their livings. He had more consideration and respect for merchants who were not treated with respect by the Persian Empire or by the Chinese.
Mongols protected traders along the Silk Road, tax their products in a fair way, and even offered loans to help traders make good deals.
