Indigenous labor supply, sustenance organization, and population redistribution in nonmetropolitan America: an extension of the ecological theory of migration.

The ecological theory of migration asserts that change in sustenance organization, to the extent that it produces changes in the opportunities for living, necessitates a change in population size. Migration may thus be viewed as a demographic response to the populations's need to reestablish a balance between its size and sustenance organization, thus attaining its best possible living standard. However, the levels of net in- or out-migration needed to restore the balance should be affected by the degree of positive or negative growth of the indigenous labor force population. We thus test the hypothesis that changes in opportunities for living will be balanced by net changes in the number of persons in the labor force, where this is a function of both indigenous labor supply and net migration.