This paper discusses the need to delineate metropolitan areas and current practice in several countries. It argues for the use of a simple algorithm that examines cross-municipality commuting patterns. Municipalities are aggregated iteratively provided they send a share of their commuters, above a given threshold, to the rest of a metropolitan area. The algorithm is implemented on Colombian data and its robustness is assessed. Finally, the properties of the resulting spatial labor market networks are explored.
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Gilles Duranton (2015) studied this question.
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