I noticed that the big jumps in births seem to occur around the boundaries of various poverty level measurements and tax brackets in the US. Hard to establish a

I noticed that the big jumps in births seem to occur around the boundaries of various poverty level measurements and tax brackets in the US. Hard to establish a direct correlation, but I think it speaks a bit to the fact that if you're really poor, having a lot of kids doesn't really change your situation. If you're a little poor, having many kids still doesn't change the situation unless it makes you really poor. But above that, you start having to really consider how having more kids will affect not only your own financial situation, but how much fewer resources you'll be able to dedicate to each child. At a certain level of income you lose access to a lot of resources that the government provides that allows a certain minimum level of care for each child. Food stamps, financial aid, tax breaks, all start to fade away as you make more money.