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A lack of stability in home prices has made it more difficult for the Obama administration to curb government's role in the country's mortgage-finance giants. David Goldman/AP hide caption

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David Goldman/AP

Former Fannie Mae CEO Franklin Raines (right) testifies on Capitol Hill in December 2008. Former Freddie Mac CEO Leland Brendsel (center) and former Fannie Mae chief Daniel Mudd (left) listen. Susan Walsh/AP hide caption

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Susan Walsh/AP

A TextMyFood servers' instruction screen shows pending requests sent via text message from customers. Courtesy of TextMyFood hide caption

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Courtesy of TextMyFood

Economists agree that the effort to recalculate the tax system should be guided by the principles of efficiency and simplicity. iStockphoto.com hide caption

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iStockphoto.com