NINO STAFFA The Chicago School of the 1920's whose main exponents were Park, Burgess and McKenzie applied Darwinian ecological concepts of invasion, succession and domin::µice to research of the development of cities. To describe the physical structure and land use patterris of cities they formulated the « concentric zone theory » of city growth. For the Darwinian concept of « biologica! competition » they substituted « economie competition ». The various zones differentiated in the model were regarded as interdependent «natural» systems essential to the survival of the whole. Figure 1 (below) illustrates the « concentric zone » model. - ........ ' '\. \ \ \ \ I I I MEN:$ HOMCS' I , .nz: / P.ESID!NTIAL / ZONE /,. 11" / COMMUTERS / / / ZONE Fig. 1 Burgess' Diagram of City Ecology. (25) In the centre of the city is the « Central Business District » (CBD), which is followed by the « zone of transition », then (25) R.E. PAHL, Patterns of Urban Life, Longman, London 1970, p. 37. 28
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