础产蝉迟谤补肠迟:听 Co-location of firms is a well-recognised strategy to take advantage of agglomeration economies. Using data at a micro-level, we explore whether there鈥檚 a hierarchical structure underlying the clustering of firms in London, and whether its composition changed after the 2008 crisis. We take particular interest in knowledge-based industries, and look into the role of diversity and the historical context for the observed patterns.聽