A Flow of Population

The industrial structure of cities, immigration and capital investments are most likely to be highly correlated. But, establishing a cause and effect relation­ship between variables like in-migration and employment would be as difficult as proving whether the egg comes first or the hen. In fact, it is not easy to deter­mine whether influx of potential workers or in-migration of adult males is raising the level of investment in the industrial sector of the cities or whether the higher level of investment in a particular sector of urban economy is attracting more and more people from other areas. One can say that it is a circular process and trying to find a linear—causal—relationship between the component factors of this process is perhaps conceptually not very sound. Moreover, an explanatory exa­mination of migration which takes only one of the dynamics—the pull force—of the process into consideration will always remain incomplete.