Someone help me please.

The correct answer to this open question is the following.

You forgot to include the passage. Without it, we do not what you are talking about.

However, doing some research we can comment on the following.

If the passage refers to the city of Trebez, in Persia, then we can say this.

One of the major economic development in Eurasia in the period circa 1200–1450 was the importance of trade in the region.

In the above-mentioned period of time, trade played an important role in the growing economies of Euroasia. The description of the passage referred that almost 200,000 householders lived in the city limits. A huge number for that time. This allowed permanent trade interactions.

For instance, in the city of Samarqand in Central Asia, it is said that had luxury structures and in the markets, one could find fine products from Russia or silk textiles from China