An empirical regularity designated as the Number-Average Size (NAS) Rule was first identified for the case of Japan by Mori, Nishikimi and Smith [71], and has since been extended to the US by Hsu [50]. This rule asserts a negative log-linear relation between the number and average population...

This paper has been superseded by WP 15-03. The authors study the location and productivity of more than 1,000 research and development (R&D) labs located in the Northeast corridor of the U.S. Using a variety of spatial econometric techniques, they find that these labs are substantially more...

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...

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 measure. But such summary measures often fail to distinguish...