This is the way the bubble ends: not with a pop, but with a hiss. Housing prices move much more slowly than stock prices. There are no Black Mondays, when prices fall 23 percent in a day. In fact, prices often keep rising for a while even after a housing boom goes bust. So the news that the U.S. housing bubble is over won't come in the form of plunging prices; it will come in the form of falling sales and rising inventory, as sellers try to get prices that buyers are no longer willing to pay. And the process...