What is industrial agglomeration?

Last (optional: Last week/month OR Yesterday etc.) I read a paper written by Stephen J.Appold, who solved two problem using the empirical methods: : (note: for colon use, it only after a full sentence, never a fragment, and second, it binds to the last word of the sentance at the end, never at the beginning) first is D does geographic proxmity to a supplier reduce the transport cost in the way of facilitating the speed of delivery time? The second is D does collaborative manufacturing increase organization performance in the form of reducing time to market and product improvement cycles? In many papers, the scholars have addressed the idea that firms cluster in on a certain region can help save costs, and the organizational agglomenration would produce external economy which help improve a firm's performance, while a small bunch of researchers have suggested that if the industrial districts overpassed overcame the limitations of the local infrastructure and managed to locate covered with unreasonable partners for specific tasks, the ongoing advantage from agglomeration for firms will would be reduced. Cause Due to the variations in the performance of potential suppliers could undercut the possible benefits of agglomeration could be undercut.