This document presents a radical new understanding of the housing bubble and financial crisis. It argues that the crisis was caused by a supply problem, not a credit problem as regulators assumed. Before 2008, housing prices in all areas increased as households moved to cheaper cities to reduce costs. After 2008, the credit shock cut prices significantly and locked many buyers out of the market. However, housing, especially low-end housing, is now undervalued and obstacles to building are pushing down interest rates. Real estate appears risky but was made volatile by a one-time demand shock, so past volatility may indicate future stability. Carefully chosen real estate investments could provide opportunities.