Between the middle of the nineteenth century and the beginning of World War I improvements in transportation and communication encouraged increasing interregional and international economic integration. This paper traces and analyzes the progress of increasing labor market integration in the...

This paper highlights the distinctive features of the theoretical approach taken by scholars" who analyzed the impacts of the mass migration into the United States in the two decades" preceding World War I. Broadly speaking, this literature was couched in terms of the "aggregate" production...