The reasons for the growth of medieval cities include?

The reasons for the growth of cities can be considered the development of crafts and trade, especially, this became noticeable in the high Middle Ages, that is, from the XI century. Paris, London, Marseille and other cities, as well as many new cities that were founded in the Middle Ages, for example, Lubeck, Riga and Venice, became large trade, handicraft (from the XIV-XV centuries also university) centers. Also, the growth of cities is associated with the breaks between wars and the end of the raids of the barbarians (took place in the early Middle Ages).