It could be, e.g., that for some reason it’s really easy to get people to have more children and really hard to get them to have fewer, or vice versa. But it seems really unlikely.
Seems really likely to me. For instance, having more children is associated with poverty. It’s a lot easier to make many people poor than to make many people rich.
Seems really likely to me. For instance, having more children is associated with poverty. It’s a lot easier to make many people poor than to make many people rich.