In microeconomics, a threshold population is the minimum number of people needed for a service to be worthwhile. In geography, a threshold population is the minimum number of people necessary before a particular good or service can be provided in an area. The concept is equivalent to the `range` in central place theory and retailing, which delin.....
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http://en.wikipedia.org/wiki/Threshold_population
In geography, the minimum number of people necessary before a particular good or service will be provided in an area. Typically a low-order shop (such as a grocer or newsagent) may require only 800 or so customers, whereas a higher-order store such as Marks and Spencer may need a threshold of 70,000 to be profitable, and a university may ne...
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https://www.encyclo.co.uk/local/21221
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