" The traditional fixed-rate 30-year mortgages, which were once a majority of all mortgages, were no longer a majority during the housing boom, as ARMs and other “creative” ways of financing the purchase of a home grew rapidly to cope with soaring housing prices. Such innovative mortgages quickly went from being rare to becoming common, especially in places with very high housing costs. "

― Thomas Sowell , The Housing Boom and Bust