Essential Definitions in Demography and Economic Geography
Population Dynamics and Demographic Measures
Demographic Transition
The shift from an older population model to a modern model of population change.
Life Expectancy
The average age that a person is expected to live at birth.
Zero Population Growth (ZPG)
A condition characterized by low birth rates and low mortality rates, with a tendency to equalize the two.
Population Density
The relationship between the population of a place and the space occupied.
Overpopulation
A condition in which the population density is extended to a limit that worsens the environment, decreases the quality of life, or causes a slump in the population.
Birth Rate (Crude Birth Rate)
The number of births occurring in a population in a year per thousand inhabitants.