The rise of mortgage wholesalers from grunts to rainmakers is one of the more curious developments of the housing bubble. Wholesalers work for banks and other lenders. The wholesaler's job is to buy loan applications from independent mortgage brokers so that lenders can turn them into loans. Wholesalers are paid on commission: the more loans they generate, the more money they make. During the housing boom, lenders typically approved the loans and then packaged them into securities. That path—from mortgage brokers to wholesalers to lenders to securities—turned out to be a road to disaster.