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Interdependence and Externalities The single word that best describes a city is interdependence. Without interdependencies, cities would be just a random occurrence. 10 Driving-time distance band (from Thrall 1999). 1 1 Externality density function versus distance from source. dence cause people and their activities to assemble in close geographic proximity. The greater the geographic proximity, the greater the impact one individual, or group of individuals, will have on others. One of the conditions that must hold for a perfectly competitive market to exist is for there to be independence between all the actors participating in the market.

So, a place can be considered urban based on expectations and perceptions. Urban land use also often extends well beyond the city limits into unincorporated areas, and might extend to other adjacent cities. These key variables that determine whether a geographic region is considered urban or rural are population density, total population, and population concentration. The cut-off points are fuzzy for defining what is required for being urban versus being rural. Therefore, on the landscape, the geographic demarcation of what separates and distinguishes urban from rural is also fuzzy.

From another standpoint, someone who owns land at a given location must realistically evaluate the demographic composition around that location, including drive-time demographic studies, so that a realistic development profile of the property can be created. Vintage and Time Geodemographics includes descriptive measurements of the population, as well as descriptive measurements of development by location over time. 7 Vintage of a city. is one of the more important descriptive space-time measurements about the urban built environment.

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