How did the mongols improve trade in china

The mongols restricted trade from foreign places, and the Mongols had a more favorable attitude toward merchants and commerce — their nomadic way of life, which is much reliant on trade with sedentary peoples, had caused them to recognize the importance of trade from the very earliest times. Thus, the Mongols worked to improve the social status of merchants and traders throughout their domains.In particular, the Mongols initiated the Ortogh, or merchant associations, that helped merchants who were in the business of long-distance trade. They also increased the availability of paper money and reduced some of the tariffs imposed on merchants. The result was an extraordinary increase of trade across and throughout.

Icannot see any engraving so i cant answer 12.massacre means wholesale slaughter and thats what happend when they the boston citizens