... the 'suburbs' to function as small independent business districts, with their own shops and businesses away from the main urban centre. This defies the sector and concentric models as they both demonstrate that the individual districts of business, industry and housing spread out from the CBD. Harris and Ullman maintained the idea that the CBD was the main centre of commerce; however, they thought specialized areas would develop to aid accessibility around the urban area. In other words, creating smaller business districts (or individual nuclei) enabling people in the suburbs to have better access to the facilities of the CBD and industrial sectors for commerce and employment. These nuclei are likely to grow as the main CBD has done, creating one large urban area as they all merge together. The emergence of new nuclei is attributed to: - Specialized requirements of particular activities - agglomeration economies :the tendency for some activities to group ...

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