What I don't understand is that native people who make a good income rationalize that they can't afford kids but yet in the same country there are many non-native people that earn considerably less that continue have children at extremely high birthrates. So why does the group that earns a lot of money claim they are incapable of supporting a family and the group that earns very little actually support a large family, in the same country?
Maybe the non-native people that earn less see their future brighter, whereas the native group with good income sees their future darker.
When you come from nothing its easier to give your kids a better future than you had.
Some animals don't breed in captivity. Some human populations also didn't breed because they were in captivity. Even though people have it better number wise, it's still possible to feel trapped.