" Back in July 2003, he’d written them a long essay on the causes and consequences of what he took to be a likely housing crash: “Alan Greenspan assures us that home prices are not prone to bubbles—or major deflations—on any national scale,” he’d said. “This is ridiculous, of course…. In 1933, during the fourth year of the Great Depression, the United States found itself in the midst of a housing crisis that put housing starts at 10% of the level of 1925. Roughly half of all mortgage debt was in default. During the 1930s, housing prices collapsed nationwide by roughly 80%. "

― Michael Lewis , The Big Short: Inside the Doomsday Machine