Prices nationwide rose nearly 6% last year — more than most ever expected, writes CNNMoney. While that has continued so far this year, leading builders to build again, prices in some places have risen faster than incomes. Eventually, they could fall back as homes become less affordable.

"If prices keeps going up at this rate for another six months, we will have a bubble, and people will get hurt," Dean Baker, co-director of the Center for Economic and Policy Research recently told Bloomberg.