John Seely Brown and Paul Duguid: The Social Life of Information, 2000

Clustered Ecologies …firms in an ecology produce synergistic effects which isolated firms find hard to imitate. Within such ecologies, the health and innovative ability of firms is not an isolated matter. Firms that feed into also feed off the ecology. The same networks that allow knowledge to flow out, allow other knowledge to flow in. Reciprocity is important to survival in the region and to regional survival.