Macro economics, you need a growing population to do capitalism at all. You can't have a shrinking consumer base.

Also. If you want to even make it a choice people CAN make, you need to equalize it. We currently punish people for having kids by a upsetting margin, at the very least it should be the same difference, you choose to have a kid, you get appropriate services to make that process at the very least, not a clear negative in all regards.

Thirdishly we are currently getting a very low level of education for our population as a whole, and that's a BIG problem when you chief exports and economy are build on innovation in computer science, physics, and petrochemicals, we need a population with the education to work and move forward or we fall behind and that's it. We actually need a highly educated population of we intent to progress as a society with our without capitalism.