Word to describe a group of businesses selling the same product in the same location

What is the word for a group of businesses all selling the same product in the same location? For example, many cities have streets lined only by jewelry stores, clothing shops, or some other specific type of merchant.

I'm looking for a way to describe that situation, something similar to the word hub .

Solution 1:

Often in a city an area where the same businesses trade is known as a quarter - as in the Jewellery Quarter

Solution 2:

It's a form of clustering called:

Retail Clustering

• The grouping of stores based on common store and demographic characteristics.

Relevant links and articles:

http://www.parkeravery.com/pov_Retail_Clustering_Methods.html

http://www.kurtsalmon.com/en-us/Retail/vertical-insight/319/The-Five-Deadly-Sins-of-Clustering

http://risnews.edgl.com/retail-news/Advanced-Planning-and-Optimization-Part-3--Store-Clustering38904