Urbanization provides two measures of the degree of urbanization of a population. The first, urban population, describes the percentage of the total population living in urban areas, as defined by the country. The second, rate of urbanization, describes the projected average rate of change in the size of the urban population over time. It is possible for a country with a 100% urban population to still display a shift in urbanization rate (up or down). For example, a population of 100,000 that is 100% urban can change in size to 110,000 or 90,000 but remain 100% urban.
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