Since the housing bubble began to burst six years ago, prices nationwide have fallen by a third. Nearly $7 trillion of home equity has been wiped out. Currently, some 14.7 million homeowners owe $700 billion more on their mortgages than their homes are worth. Going forward, prices are likely to fall further as banks put a backlog of foreclosed properties on the market. As home prices fall and more homeowners sink underwater, there will be more foreclosures and more price declines.

So what is Mitt Romney’s response? Bring it on.

In interviews and in the Republican presidential debates, Mr. Romney has said that the cure for foreclosures is for the government to get out of the way and let the process run its course. Once prices hit bottom, investors and want-to-be homeowners would presumably swoop in and prices would stabilize.

The argument might have some red-meat appeal, playing off the notion that any owners who lose their homes are getting what they deserve. It is wrong on several counts:

Efficiency. Mass foreclosures are a rotten way to stabilize the market. They impose huge costs on neighbors, communities and local governments, and on the broader economy, as falling prices erode equity, depress consumer spending and mire the housing market in a deep hole.

Logic. Who does Mr. Romney think will buy up millions of foreclosed properties? Borrowers who lose their homes to foreclosure or who sell their homes for less than the balance on their mortgages can be denied credit for years; many will never be homeowners again.