" Subprime mortgage lending was still a trivial fraction of the U.S. credit markets—a few tens of billions in loans each year—but its existence made sense, even to Steve Eisman. “I thought it was partly a response to growing income inequality,” he said. “The distribution of income in this country was skewed and becoming more skewed, and the result was that you have more subprime customers. "

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