Net migration as a demand multiplier for housing
Net migration (people moving into a region minus those leaving) is the primary driver of housing demand in modern America. A region gaining 50,000 net people per year needs roughly 15,000-20,000 new units annually just to house them, not counting generational household formation. Conversely, shrinking regions face surplus housing and price deflation. Migration patterns track job availability, climate preferences, cost of living, quality of life, and tax regimes. In-migration to Austin, Denver, and Boise in the 2010s generated housing demand that far exceeded new supply, compressing affordability indices.
Birth rates and immigration in secondary roles
Birth rates declined sharply in the US (from 2.1 to 1.6 children per woman), reducing natural household growth. Immigration adds workers but is politically volatile. Migration between states is now the dominant signal for housing demand forecasting; demographers watch Census migration data more closely than birth projections. Regions attracting net in-migration can assume demand growth; regions experiencing net out-migration are oversupplied and face downward pressure.