Investor purchases of American homes dropped 45.8% year over year last quarter, according to Redfin.Steve Pfost/ Getty Images The US housing market is historically unaffordable, and home sales and inventory remain low. National Association of Realtors data shows existing-home sales are down 16.6% from last July. At the same time, total housing inventory is 14.6% lower compared to a year ago. Americans are facing a historically unaffordable housing market thanks in part to the Fed's high interest rates and a decade of under-supply of homes across the US.