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by parpfish 689 days ago
I think the both rate thing is in reference to studies like those discussed here: https://www.lesswrong.com/posts/c4daDbQD398BmW5k5/on-car-sea...

The idea is that you can only fit two car seats in the backseat and upgrading to a larger car that could fit three is enough of an expense/hassle that it discourages having a third child