Shiller lukewarm

That would be Robert Shiller, from the much-followed S&P/Case Shiller home price index. He believes the housing turnaround is real (borne out by an increase in L.A. home prices from June to July), but he also expects the market to move mostly sideways for a loooong time - like five years. And there's always the possibility that prices will head back south if the foreclosure situation worsens. He talks to the WSJ:

What are the main factors driving U.S. house prices? What could push them up, or cause another slump?

Shiller: The main factor is the world economic crisis and the efforts of governments around the world to stimulate the economy. Parts of those efforts have been directed at the housing market. In the U.S., there is an 8,000 dollar first-time home buyer's tax credit which expires at the end of November. That's a reason for concern, as it comes to an end. Also, the Federal Reserve has a plan to buy $1.25 trillion worth of mortgage-backed securities to support the housing market. They are most of the way through the program and anticipate phasing it out at some time in 2010 - that's another thing that will go away. We've yet to see how the housing market will continue. Part of the problem is that people are buying now rather than later. When later comes, there could be a downturn in the market.

Is there an oversupply of houses in the U.S.?

Shiller: That's been a problem. The inventory of unsold houses has been high, but has come down a bit. On top of that, there will be more foreclosures, more homes are going to be dumped on the market as people default. Now, that may show down as home prices will start going up again. But I suspect that this isn't going to happen. Also, banks have more REO, or real estate owned, that they're holding on to for the time being. But eventually those REOs are going to be dumped on the market. So that's why it doesn't look particularly encouraging from a supply consideration.