Why did the growth of cities lead to the expansion of trade?

Because each city has its own product, the excess of which could be sold. Thanks to trade, a surplus of money appeared, this had a positive effect on the country’s economy. The villages were remote and less developed. Therefore, the main influx of people was in the cities. In developed cities there is an influx of residents and intellectuals. They contributed to the development of cities through discovery, research. These same people also became buyers, thus increasing the demand for goods. The workers, who were subordinate to the feudal lords and lords, opened their own business and became monopolists.