1) The housing bubble was driven by supply, not credit, as Americans built new homes to reduce costs by moving to more affordable areas. 2) After 2008, housing markets were driven by a credit shock as low-tier home prices collapsed, rather than by addressing the underlying supply issues. 3) Regulators incorrectly treated the crisis as a credit problem rather than a supply problem, cutting home prices, devastating homeowners' equity, and locking many buyers out of the market long-term.