There are 140 million personal residences in the US. Today, there are 19 million homes either directly or indirectly for sale. According to a survey by Zillow.com, a real estate appraisal website, 5 million homeowners plan to sell on any improvement in prices. Add to that 4 million existing homes now on the market, 1 million new homes flogged by companies like Lennar (LEN) and Pulte Homes (PHM), and 1 million bank owned properties. Another 8 million mortgage owners are late on their payments and are on the verge of foreclosure, bringing the total overhang to 19 million homes.