Spatial concentration of manufacturing industries in the United States: re-examination of long-run trends

We re-examine the long-run geographical development of US manufacturing industries using recent advances in spatial concentration measures. We construct spatially weighted indices of the geographical concentration between 1880 and 2007 taking into account industrial structure and checkerboard problem. New results emerge. Average spatial concentration was much lower in the late 20th than in the late 19th century, and it was the outcome of a continuing reduction over time. Spatial concentration did not increase in the early 20th century but declined, and we find no inverted-U shape pattern of long-run spatial concentration. The persistent tendency to greater spatial dispersion was characteristic of most industries.