US News and World Report
The housing market has improved significantly since the start of 2012, thanks in large part to the elevated role of investors and all-cash homebuyers, which accounted for about 19 percent and 30 percent respectively of all sales in March 2013, according to the National Association of Realtors.
http://www.usnews.com/news/blogs/home-front/2013/05/03/what-happens-to-the-housing-market-when-the-investors-leave
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