"More resources -> less reproduction" has, to the best of my knowledge, one example in the entire animal kingdom: Us.
You're looking at the reasons, which are also interesting, but the next layer of abstraction down from the point I'm making. (Though I'm not sure you're not explaining why poor people have fewer (surviving) children, which is the opposite of the data....)
You're looking at the reasons, which are also interesting, but the next layer of abstraction down from the point I'm making. (Though I'm not sure you're not explaining why poor people have fewer (surviving) children, which is the opposite of the data....)