Correlation does not equal causation. I feel this study shows correlation, but fails to prove any associated causation.
Maybe people just avoid 3 kids, because it’s hard enough raising one or two kids.
Maybe people just avoid 3 kids, because it’s hard enough raising one or two kids.
Their causal explanation relies on two additional observations that seem pretty hard to explain by other theories: the effect disappears for single-parent and carless households.