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Stable Population

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The concept of a stable population in demography was first defined by A.J. Lotka. We say that a population is stable if the following three conditions are satisfied:

  1. The age and sex distribution of the population remains constant.
  2. The birth rate and death rate for each age remains constant.
  3. There is no immigration into or emigration out of the population.

Since the birth and death rates of the population are constant, therefore the population grows at a fixed rate. This is known as Malthus Law for population growth.

The concept of stable population must not be confused with the concept of stationary population. In a stationary population, the size of the population remains the same whereas, in a stable population the population size increases at a constant rate.

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