The assumption that we need to increase population to stay prosperous is false! Every civilization that has suffered severe population decreases from war or disease has been blessed with individual prosperity because the population automatically becomes more efficient and supplemental by natural necessity! The only people gaining wealth from higher and higher populations are the Monopolies and mass producers. Managed societies can keep a level population and weed out the social problems to live at higher standards with cleaner morals! You only need to compare small farming towns to large filthy cities to see the proof!