väestönvaihtelun
Väestönvaihtelu, also known as demographic transition, is a model describing the historical shift from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system. This process is typically divided into distinct stages.
In the first stage, both birth rates and death rates are high, resulting in slow population growth.
The third stage sees birth rates start to decline, often due to increased access to education, urbanization,
The demographic transition is not a uniform process and can vary in speed and specific characteristics depending