This is a far better option than working out why nobody either wants, or is able to, have kids.
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I’m not sure immigration is the full answer. It may help. But, there is a very good reason why Koreans (and many other developed countries) have diminishing populations. The cost of living is out of control. Immigrants just can’t move to Korea and start families. Unless they target (i.e. exploit) people from poorer countries who will accept a substandard quality of life and work themselves to death by scraping by to provide for a family.
How exactly would that help?
If their population say, reduces to like 25% of it’s peak, then that means they won’t have enough people to do all the jobs that need to get done. Immigrants would alleviate that issue to some degree.
South Korea on brink of ‘extinction’ unless embraces immigration drift hunters, says minister. S