The ability of wage differentials to perform the function of allocating labor supplies, as posited by conventional economic theory, is the central issue of recent research on labor mobility. Most mobility studies, however, have taken the local labor market as the framework for study and analysis...

As most students of the labor market know, comparable data on migration and mobility of workers over time and from place to place are not available in the form and detail often desired for research. One source which is reasonably free of the usual problems of comparability, though limited in...