Discipline: Economics
Demographic transition is a process by which underdeveloped countries experience a change in their birth and mortality rates because of a change in the economic development of the state.
Over time and with rising influence, high birth and death rates are replaced by slower or declining birth rates.
Also see: Malthusian population theory, secular stagnation theory
Source:
F Notestein, 'Population: the Long View', Food for the World, T W Schultz, ed. (Chicago, 1945)