Natural increase rate (NIR)
Definition
The natural increase rate (NIR) is the difference between birth rates and death rates within a population. It represents the rate at which a population grows without considering migration.
Analogy
Imagine NIR as an ice cream cone with two scoops - one scoop represents births, while the other scoop represents deaths. The natural increase rate is determined by how quickly these scoops melt or grow over time.
Related terms
Birth rate: The number of live births per 1,000 individuals in a population within a given year.
Death rate: The number of deaths per 1,000 individuals in a population within a given year.
Population growth rate: This refers to the overall growth or decline of a population over time, taking into account both natural increase (births minus deaths) and net migration.
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