>I don't get why they blame the low fertility rates as the main reason of the japanese economic problem
Obviously it is because there are no young people, especially anywhere else but in the big cities.
What is there not to understand?
When I lived there, I was on the countryside, a city with 500k people ~3h away from Tokyo. My neighbourhood was basically only old people and empty houses. One day they found our neighbour dead in his house and he has been dea there for several weeks and nobody noticed. This is quite common. Also, if you start a family and have a job, the government will GIFT you a house.
yes they call cities with 500k people countryside, asia is weird