It's really interesting on that front to see what is happening in Japan: http://www.economist.com/news/asia/21713868-there-arent-many-and-cities-are-growing-de

It's really interesting on that front to see what is happening in Japan: http://www.economist.com/news/asia/21713868-there-arent-many-and-cities-are-growing-desperate-desperately-seeking-young-people http://www.economist.com/news/asia/21713868-there-arent-many... Japan has developed world birth rates and very low immigration. Japan's population has decreased by 1M already. https://www.washingtonpost.com/news/worldviews/wp/2016/02/26/its-official-japans-population-is-drastically-shrinking/?utm_term=.f8e653d26fcd https://www.washingtonpost.com/news/worldviews/wp/2016/02/26... Globally as poor countries get richer and emigrate less this is what is likely to happen in many places.