It doesn't need to be hereditary. Just needs to be in the range where on one hand a person doesn't want the next generation to go through the same and on the ot

It doesn't need to be hereditary. Just needs to be in the range where on one hand a person doesn't want the next generation to go through the same and on the other, where making the most out of their current situation means not starting a family. It's what's happening right now, just with poverty being the largest factor. Gig/minimum wage workers start families considerably less often and no wonder - how they are supposed to?