Geographic clustering in inventive activity has often been attributed to clustering in production. For the glass industry, we find that despite a general association between location of invention and production, there were significant deviations. Centers of production were not always centers of...

The standard view of U.S. technological history is that the locus of invention shifted during the early twentieth century to large firms whose in-house research laboratories were superior sites for advancing the complex technologies of the second industrial revolution. In recent years this view...