... was built from Burgess' observations of a number of American cities, for which he provided empirical evidence. The model assumes a relationship between the socio-economic status (mainly income) of households and the distance from the CBD. The further from the CBD, the better the quality of housing, but the longer the commuting time. Thus, accessing better housing is done at the expense of longer commuting times (and costs). According to this monocentric model (see above figure), a large city is divided in six concentric zones: * Zone I: Central Business District (CBD) where most of the tertiary employment is located and where the urban transport infrastructure is converging, making this zone the most accessible. It would contain all of the shops and offices and was known to be the centre of attention of the town. * Zone II: Immediately adjacent to the CBD a zone where many industrial activities locate to ...

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