It means a younger population and plenty of workers, which in turn keeps salaries down. More people competing for jobs, less old folks demanding pensions and medicare. Law of Supply and Demand, tight?

That's why the Russians are kidnapping Ukrainian kids. Russians aren't having babies, and they see a demographic crisis coming in their future.

You didn't think GOP opposition to abortion and birth control was solely for religious reasons, did you?
I know this because I'm one of the "childless Left", by design. I never wanted kids, they're an expensive hobby and I had plenty of other plans for my life. I could see how difficult it was for my parents to bring my brother and I up, and I wanted no part of it. This in turn gave me more options in life and a better ability to make wiser career choices. And that's why most Western countries have declining birth rates and smaller families.