The observation of population distribution within a country, revealing a specific proportional relationship between city rank and population size, is a fundamental concept in urban geography. This concept posits that the nth largest city’s population is 1/n the size of the largest city. For example, if the largest city has a population of 1 million, the second-largest city is expected to have a population of approximately 500,000, the third-largest around 333,333, and so on. This model provides a benchmark for understanding how populations are spread across urban centers.
Understanding this population distribution pattern offers insights into a country’s economic development, resource distribution, and administrative structure. A distribution that closely adheres to the predicted pattern often indicates a well-integrated and balanced urban system. Deviations from this pattern can highlight issues such as primacy (where one city is disproportionately larger than others), regional disparities, or historical influences that have shaped settlement patterns. Its historical context involves its initial observation and formulation as an empirical regularity in city sizes across different countries and time periods. This discovery laid the groundwork for further investigation into the factors influencing urban development.