UB GEO 103LEC - OLec9 City3 (42 pages)

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OLec9 City3



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OLec9 City3

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Pages:
42
School:
University at Buffalo-SUNY
Course:
Geo 103lec - Global Econ Geographies

Unformatted text preview:

Central Places and Cities 103 10d Idea of gravity cities exert a gravitational pull on activities cities function as central places and support activities around them cities service areas around them hinterlands or urban fields Strength of influence A B Distance mi Identify market or trade area to businesses Friction of distance in gravity and hence market influence 1 Definitions Central Place Theory Hinterlands areas market or trade areas that a city serves e g market area may be measured in terms of newspaper circulation or telephone class or journey to work Threshold minimum number of people or demand volume of sales required to stay in business Range maximum distance customers willing to travel to purchase a good or service or perform a function Order of good function interaction of threshold and range Bread Low threshold and range low order good function Brain surgery high threshold and range high order good function 2 Some tentative conclusions 1 Low order goods and function are more abundant in space 2 Higher order goods and functions are fewer in space 3 Smaller cities have more lower order goods functions 4 Larger cities have more higher order goods functions Hierarchy of cities hamlets towns cities 3 Walter Christaller s Central Place Theory CPT A Central Place is a settlement which provides one or more services for the population living around it Postulates that cities are central places which are organized in a hierarchical manner small towns have only lower order goods functions and there are many small towns Bigger cities have higher order goods functions and fewer of them D e n v e r 4 Assumptions of central place theory Isotropic plane Uniform distribution of demand and population Cities depend solely on hinterland trade No government or social class Transportation costs are equal Ubiquitous production input at same price 5 Why are there very few large settlements K 3 marketing principle A city B town each B town is midway between 3 big A cities 1 3



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