其他摘要：Conventional analyses of labor markets assume their boundaries to be fixed. For exan1ple, urban geography long focused on the urban commuting sheds of workers, in which it was assumed that the high friction of distance involved in commuting limited the extent to which workers could travel for jobs. The existence of long-distance commuting patterns is simply inconceivable in such a perspective. In this light, wages for a given occupation could be assumed to be relatively equal within a particular labor market. This assumption is significant, for example, in the use of counties as the primary unit in the Census' definition and measurement of Metropolitan Statistical Areas (MSAs).
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