The term describes a multi-stage model that outlines the historical shift in population growth patterns of a country as it develops. This model is characterized by changes in birth rates and death rates over time. Initially, both rates are high, leading to slow population growth. As a nation industrializes and modernizes, death rates decline due to improvements in healthcare, sanitation, and food availability. Birth rates remain high for a period, causing rapid population expansion. Eventually, birth rates also decrease, often due to factors like increased access to contraception, education for women, and a shift towards urban living. Finally, both birth and death rates stabilize at low levels, resulting in slow or even negative population growth.
Understanding this transition is crucial in population studies because it provides a framework for analyzing and predicting population changes in different countries. It helps explain disparities in population growth rates globally and offers insights into the social, economic, and technological factors driving demographic shifts. Historically, most developed nations have progressed through these stages. The model also assists in understanding the potential challenges and opportunities associated with different stages of population development, such as the economic burden of a large young population or the challenges of supporting an aging population.