Poston D L, White R
Demography. 1978 Nov;15(4):637-41.
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.
迁移的生态理论认为，生计组织的变化，只要它导致生活机会的改变，就必然会引起人口规模的变化。因此，迁移可以被视为人口对其规模与生计组织之间重新建立平衡的需求的一种人口统计学反应，从而实现其最佳生活水平。然而，恢复平衡所需的净迁入或净迁出水平应受到本地劳动力人口正增长或负增长程度的影响。因此，我们检验这样一个假设：生活机会的变化将由劳动力人数的净变化来平衡，而劳动力人数是本地劳动力供给和净迁移的函数。
