> strong correlation between rent prices and fertility rates. I assume you mean a positive correlation. When the Soviet Union collapsed, many of the former Ea

> strong correlation between rent prices and fertility rates. I assume you mean a positive correlation. When the Soviet Union collapsed, many of the former Eastern Block countries experienced both, a reduction in fertility and too much housing. The latter because so many left for the west. So many buildings were empty that quite a bit of housing stock was removed, see e.g. [1]. [1] https://www.eisenhuettenstadt.de/Leben-Wohnen/Wohnen-und-Bauen/Stadtentwicklung/Stadtumbau/R%C3%BCckbau/ https://www.eisenhuettenstadt.de/Leben-Wohnen/Wohnen-und-Bau...