Dumais, Guy; Ellison, Glenn; Glaeser, Edward L. - 2021
' agglomeration levels tend to remain fairly constant, we find that there is greater variation in the locations of these … significant role in reducing levels of geographic concentration, while plant closures have tended to reinforce agglomeration …. Finally, we look at coagglomeration patterns to test three of Marshall's theories of industry agglomeration: (1) agglomeration …