The standard approach to studying industrial agglomeration is to construct summary measures of the "degree of agglomeration" within each industry and to test for significant agglomeration with respect to some appropriate reference measures. But such summary measures often fail to distinguish...

Dating from the seminal work of Ellison and Glaeser [7] in 1997, a wealth of evidence for the ubiquity of industrial agglomerations has been published. However, most of these results are based on analyses of single (scalar) indices of agglomeration. Hence, it is not surprising that industries...

Typical analyses of industrial agglomerations start with some aggregate measure of the "agglomeration degree" for each industry, and attempt to explain differences in these values across industries by regressing them on sets of industrial attributes. But this aggregation makes it difficult to...