In this reply to Peter Taylor, three points are made: Peter Taylor is correct in stating that I have not tested the 'Jacobs hypothesis'; the 'Jacobs model' (as I understand it) is, I suggest, unverifiable; and, continuing from my original article, I restate the argument that 'cities',...

A growing literature has accumulated that points to the stability of industrial location patterns. Can this be reconciled with spatial dynamics? This article starts with the premise that demonstrable regularities exist in the manner in which individual industries locate (and relocate) over...