In terms of the existing pattern at any given time in an urban area, it is easy to explain sectoral differentiation on the basis of such factors as (1) topographical and other "natural" variation, (2) the presence of a limited number of important radial transport routes, and (3) the previously discussed incentives toward a greater concentration hand of any one activity than a symmetrical ring concentric layout would afford. But the Hoyt hypothesis is couched primarily in dynamic terms, as an explanation of persistent sectoral differences in the character of development. And in that context, it introduces two further useful concepts.
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