muir tells us. >> great to you. some homes have been on the market a year or more before selling. now the average is four months. we start with one viewer bifing up. massachusetts mom mr. jennings took us on the tour of their home. the first spring in mass maz. >> by far, the favorite room of the house. >> reporter: they are here because they sold their last market, eight months on the market. they upgraded following a job for her husband. and it allowed them to move on and build a new home. it's a simple domino effect the economists are seeing again. >> it's jobs and confidence. we have been adding jobs and that is good. because it gives people the confidence go out and buy. >> reporter: and what truly drives the housing market? the existing homes. 90% of home sale are not brand new ones but the ones already in your neighborhood. and who is driving the sales? >> andy and wait, popular with the show "house hunters." the first, just under $300,000. >> i don't think it was our style. >> reporter: the second, just under 190,000. two bedrooms instead of three. and lastly, the least expensive. the largest. but the renovations, the lostliest. they bought number two. today w