So now most large cities have at least two CBDs. Around airports cropped up commercial ecosystems comprising industries that relied on air cargo, hotels that served frequent air travelers, and residential units that served the workers who found employment in all these air travel-related commercial establishments. Within a few decades, however, airports became important landmarks in most major cities in the world. CBDs were typically located either around seaports, or the inland transportation hubs around which the city was originally founded. When the concentric zone model was first proposed in 1925, commercial air travel was in its infancy, and most major cities in the world did not yet have airports. The reason that such multiple nuclei develop is that different kinds of commercial and industrial activities have different spatial and environmental needs.įor instance, export or import-dependent industries need to be located close to airports or seaports. The multiple nuclei model improves upon the concentric zone model by proposing that cities need not have a single central business district (CBD), but instead can be composed of multiple commercial centers or multiple nuclei around which commercial and residential zones emerge. Whereas the concentric zone model envisages cities with one central business district (CBD), the multiple nuclei envisages cities with several CBDs serving different industry needs.Ī prominent drawback of the concentric zone model was that it could not explain situations where cities, with time, had developed multiple central business districts, and thus had multiple concentric zones of commercial and residential areas emanating outwards from each. Conclusion Multiple Nuclei Model vs Concentric Zone Model
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