It depends on how you ascribe causation to hereditary factors. Does it make sense to say that a 4 year old is poor because of his low IQ? I don't think so, because a 4 year old has no agency over his economic circumstances.
Does it make sense to say that a 4 year old is poor because of his low IQ?
No.
But it does make sense to say that a 4 year old is both poor and has a low IQ because his parents do. And this applies whether you believe that his low IQ is due to heredity or a poor environment caused by his parents.
I actually don't believe at a micro-level that causation comes into play at all. I was responding to the statement that at a macro-level there is probability of causation, and it is more rational that poverty is caused by stupidity than poverty causes stupidity. The latter is nonsense.
No.
But it does make sense to say that a 4 year old is both poor and has a low IQ because his parents do. And this applies whether you believe that his low IQ is due to heredity or a poor environment caused by his parents.