https://www.cambridge.org/core/journals/central-european-history/article/abs/pledge-unredeemed-the-housing-crisis-in-weimar-germany/E320C5639132FE4E2CC8219A1FB51955
Did you know that Nazi Germany offered interest-free mortgage loans? A young German family could get an interest-free mortgage and each of their newborns would reduce their mortgage burden by 25%. If they had 4 kids, their mortgage was paid off. Germany went from extinction-level 1.7 kids/family to 2.3 kids/family in about 5 years.