Competition over the Wool/Woolens trade (12th C map)
Lines among clusters
Cluster 0
Cluster 1 Raw wool
Cluster 2 Woolens
Cluster 3 both
Cluster 4 Port
Cluster 5 Raw+Port
Cluster 6 Woolens+Port
Next - Map of Trade Routes
The port cities of Genoa and Venice in Italy, and London-Ghent-St. Omer in the north had both wollen manufacture and shipping of wollens for export, with London also shipping raw wool. Many other port cities (clusters 4 and 5) shipped raw wool but lacked and could not compete with others in the wollens industry. Since this graph shows only the towns on the bicomponents of the network, many towns in England and the Low Countries are not shown that had either raw wool (category 1) or raw wool and a woolens industry (cluster 3), but there were few such towns in Italy (e.g., Siena?). Many other towns with a woolens industry alone (category 2) were on the bicomponent routes, which were the main routes of trade in which merchants resided.

'Mediterranean Europe imported large quantities of cheap cloth from the Low Countries and England.'

'The dominant area of Europe in which luxury cloth was produced was in large quantities was in the Southern Netherlands.'

'In the twelfth century, the key towns for the wollen cloth industry in the Southern Netherlands were Arras, Douai and Lille..., Valenciennes..., Cambrai and Tournal. Arras was then the principal commercial centre, with Montreuil as its port.' [cluster 4] (p. 232)

'However, the key places in which the woolen cloth was actual made went on changing considerably over these three centuries.' (p. 233) Note that the wollens industry shifted from England to those northern Lowlands cloth towns than remained on the main trade bicomponents, and some of the southern routes were broken by transfers to French dominions. The clothing industry is often seen as one of the main means of mobility of what are called semi-peripheries in world-system models, and that seems also to be the case in the 12-15th centuries.