In 1960, Stouffer further modified his theory of intervening opportunities and added a concept of competing migrants. According to the new model during a given time interval, the number of migrants from city 1 to city 2 is the direct function of the number of opportunities in city 2 and an inverse function of the number of opportunities intervening between city 1 and city 2, and also the number of other migrants for the opportunities in city 2.
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