Shiller: Up to 25% further drop in housing prices possible

From CNN Money:

In an off-hand remark before cameras and microphones, economist and housing market guru Robert Shiller opined earlier this year that he would not be shocked if there was another 10% to 25% in the nation's home price plunge — and he's not backing down from that statement.

At a S&P Housing Summit in New York, Shiller on Thursday reiterated his fears of falling home prices. It's not a forecast, he said, just a comment on his understanding of housing market trends.

He explained that speculative markets, like stocks or commodities, act like random walks. They go up and down all the time. Housing market direction tends to be more consistent.

"I worry that this is a real and continuing downturn, like in Japan," Shiller said. "It had a boom in the 1980s that peaked in 1991. Prices declined in the major cities for 15 straight years after that."