3 ms·
It's only temporary, although it could in principle last a few centuries. Birthrate isn't homogeneous in a population, and is partly transferable across genera
by jessriedel 10y ago
It's only temporary, although it could in principle last a few centuries. Birthrate isn't homogeneous in a population, and is partly transferable across generations, either culturally or genetically. So subpopulations with higher birthrate will eventually come to dominate.
Dramatically over-simplified model: Mormons in the US have 3.4 children compared to the national average of 2.1. They currently number about 6M, or 2% of the US population. If they grow by a factor of 3.4/2.1=1.62 (i.e., 62%) each generation, then it takes 8.1 generations, or a bit over 200 years, for them to become the majority.