Demographic Transition
What is Demographic Transition?
The demographic transition is the shift from high birth and death rates to low ones as incomes rise, with a population surge in between as deaths fall first.
In the first stage births and deaths are both high and population barely moves. Clean water, a steadier food supply and basic medicine then cut death rates well before families adjust their fertility, which is why the second stage is where population grows fastest. Births fall in the third stage as more children survive, as families move to cities where children cost more and earn less, and as schooling and paid work expand for women, until the fourth stage settles at low births and low deaths. The economic payoff sits in the middle, where the working-age share of the population peaks and output per person can climb quickly if there are jobs and schools to use it.
Demographic Transition: a worked example
A hypothetical country in stage two records 36 births and 12 deaths per thousand people. Natural increase is 36 - 12 = 24 per thousand, or 2.4 percent a year, which by the rule of 70 doubles the population in 70/2.4, about 29 years. The same country in stage four records 11 births and 9 deaths per thousand: growth of 2 per thousand, or 0.2 percent, and a doubling time of 70/0.2 = 350 years. Neither snapshot looks dramatic, yet the two regimes are twelve times apart in speed.
The mistake students make with demographic transition
The usual mistake is to picture the population boom as a rise in birth rates. Birth rates do not rise during the transition; death rates fall first and births follow decades later, and the gap between the two curves is the entire surge. A second error is treating the four stages as a timetable every country must follow at the same pace, when the speed at which fertility falls varies widely.
Demographic Transition questions
What are the stages of the demographic transition?
There are four: high births with high deaths and flat population, falling deaths with high births and fast growth, falling births with slowing growth, then low births with low deaths and a stable population. Some versions add a fifth stage in which births drop below deaths and population shrinks.
Why does population grow fastest in the middle of the transition?
Because death rates fall before birth rates do. Sanitation, food supply and vaccination cut mortality within a single generation, while family size responds slowly to child survival, urban living and schooling, so for several decades many are born and few die.
What is the demographic dividend?
The demographic dividend is the growth boost a country gets while the working-age share of its population is at its peak. Fewer dependents per worker means more output per person and more household saving, but it only materializes if the economy creates jobs and schooling for the extra workers.
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