>natural human behavior, that the wealthy people have only few children
It's a socioeconomic phenomenon of the Industrial Age's middle class, the upper class continue to multiply like in the good old times, having 3 to 6 kids is not uncommon.
It's a socioeconomic phenomenon of the Industrial Age's middle class, the upper class continue to multiply like in the good old times, having 3 to 6 kids is not uncommon.
Industrial Age: fertility rates (of the middle classes) are negatively correlated with prosperity.