by Calculated Risk on 8/23/2005 07:41:00 PM

Here are some excerpts from a FoxNews interview with Yale Economist Robert Shiller said:

Shiller admits he doesn’t have a short, simple definition and then goes on to say that defining a bubble "is similar to the way psychiatrists define a mental illness, that is, it involves a list of symptoms."

Indeed, to hear Shiller describe a financial bubble it sounds like a disease. "It’s a social contagion," he says, "An epidemic whose mode of transmission is word of mouth. It’s emotional. People keep hearing about price increases. There’s a tinge of envy about other people who have done well, which brings more and more people into the market. This, in turn, pushes prices up." In other words, it's a self-fulfilling prophecy.

And Shiller expects the end to be ugly:

... the most important issue is not whether or when the bubble will burst, but what the "end" will it look like. Shiller confesses he has no idea. He says a lot depends on the other factors or "symptoms" in the mix.

In the extreme scenario, buyers start to default on adjustable-rate mortgages and trigger a financial crisis in the banking sector. Real estate prices nosedive as properties are abandoned. If this is compounded by significantly higher oil prices, "it could change the psychology," says Shiller. "Consumer confidence plummets and people pull back on spending." This causes a downward economic spiral and leads to recession.

In the "soft landing" version, real estate prices simply remain flat for years, much as they did after the boom in the 1970s, until they’re back in line with inflation. "This is what people are counting on happening," says Shiller. He considers this outcome unlikely "because the signs of a bubble are stronger."

Though he admits there are so many variables it’s impossible to forecast it precisely, Shiller says he senses that the housing bubble is "more likely to turn out badly."