The theory is based on early twentieth century rail transport and does not make allowances for private cars that enable commuting from cheaper land outside city boundaries. This occurred in Calgary in the 1930s when many near-slums were established outside the city but close to the termini of the street car lines. These are now incorporated into the city boundary but are pockets of low cost housing in medium cost areas.
Physical features - physical features may restrict or direct growth along certain wedges
The growth of a sector can be limited by leapfrog land use
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