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The diminishing in importance and eventual disappearance of a phenomenon with increasing distance from its origin.
migration to a distant destination that occurs in stages, for example, from farm to nearby village and later to a town and city
the idea that one place has a demand for some good or service and two places have a supply of equal price and quality, then the closer of the two will get the job, thereby blocking the other from being able to use its supply
motion that recurs over and over and the period of time required for each recurrence remains the same
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