Newer Developments
Newer theoretical developments have shown that it is possible to overcome the static aspect of CPT. Veneris (1984) developed a theoretical model which starts with (a) a system of evenly distributed ("medieval") towns; (b) new economic activities are located in some towns thus causing differentiation and evolution into an hierarchical ("industrial")city system; (c) further differentiation leads into a post-hierarchical ("postindustrial") city system. This evolution can be modelled by means of the three major CPT theories: stage (a) is a system of von Thunen "isolated states"; stage (b) is a Christallerian hierarchical system; stage (c) is a Loschian post-hierarchical system. Furthermore, stage (b) corresponds to Chris Alexander's "tree" city, while (c) is similar to his "lattice" system (following his dictum "the city is not a tree").
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