Although the National Association of Realtors said for many years that home prices historically don’t fall, actually they do, and sometimes quite sharply. The housing market is complicated, and the future unknowable. Still, for clues to the overall direction of prices, Mr. Ritholtz advises buyers to look at three metrics: the ratio of median income to median home prices, which suggests whether people can afford a house; the cost of ownership versus renting; and the value of the national housing stock as a percentage of gross domestic product.

All those measures were aberrationally inflated during the housing bubble. And they still aren’t back to historical norms. We can get back to the norm in either of two ways, Mr. Ritholtz says: home prices can either drop an additional 15 percent or go sideways for seven years or so, while G.D.P. and income presumably grow.

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