A note on Keyfitz's theorem on the mixture of population.
"Keyfitz showed [that] if there are n sub groups of a population having constant exponential growth rate then the overall growth rate has positive derivative and hence it will go on increasing. But in this note we show that if the exponential growth rate is taken to be varying over time then the overall growth rate will not necessarily be increasing."
D003710:Demography; D008962:Models, Theoretical; D011153:Population; D011157:Population Dynamics; D011158:Population Growth; D012106:Research
Demographic Factors; Models, Theoretical; Population; Population Dynamics; Population Growth; Research Methodology; Theoretical Studies; World