Bubbles Forever

NEW HAVEN – You might think that we have been living in a post-bubble world since the collapse in 2006 of the biggest-ever worldwide real-estate bubble and the end of a major worldwide stock-market bubble the following year. But talk of bubbles keeps reappearing – new or continuing housing bubbles in many countries, a new global stock-market bubble, a long-term bond-market bubble in the United States and other countries, an oil-price bubble, a gold bubble, and so on.

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Bubbles without Markets

A speculative bubble is a social epidemic whose contagion is mediated by price movements. News of price increase enriches the early investors, creating word-of-mouth stories about their successes, which stir envy and interest. The excitement then lures more and more people into the market, which causes prices to increase further, attracting yet more people and fueling “new era” stories, and so on, in successive feedback loops as the bubble grows. After the bubble bursts, the same contagion fuels a precipitous collapse, as falling prices cause more and more people to exit the market, and to magnify negative stories about the economy.

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Bubble Spotting

NEW HAVEN – People frequently ask me, as someone who has written on market speculation, where the next big speculative bubble is likely to be. Will it be in housing again? Will it be in the stock market?

I don’t know, though I have some hunches. It is impossible for anyone to predict bubbles accurately. In my view, bubbles are social epidemics, fostered by a sort of interpersonal contagion. A bubble forms when the contagion rate goes up for ideas that support a bubble. But contagion rates depend on patterns of thinking, which are difficult to judge.

Big speculative bubbles are rare events. (Little bubbles, in the price of, say, individual stocks, happen all the time, and don’t qualify as an answer to the question.) And, because big bubbles last for many years, predicting them means predicting many years in the future, which is a bit like predicting who will be running the government two elections from now.


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Continued housing volatility a sure bet

By Robert J. Shiller at chinaview.cn

BEIJING, Jan. 4 -- Volatility in the housing market has long been known, but until now it has never been visible in so many places around the world at the same time. Indeed, the year 2009 might even be a milestone marking a new era of volatility.

Since 2000, we have seen the most dramatic evidence ever of speculative bubbles in markets for owner-occupied homes. Home prices exploded after 2000 in North America, Europe and Asia, and in many isolated places elsewhere in the world. Markets peaked in 2007, and then fell sharply in many of these places with the onset of the global financial crisis. Surprisingly, prices rebounded in some places in 2009. It seems the story never ends.

In the United States, the S&P/Case-Shiller 10-City Home Price Index recorded the biggest turnaround since the index began in 1987, rising 5 percent (a 15 percent annual rate) from April to August 2009, after having fallen 7 percent (a 21 percent annual rate) in the four months from December 2008 to March 2009. Recent increases in home prices have also been seen in Australia, the UK, South Korea, Singapore, Sweden and the Hong Kong Special Administrative Region, and optimistic talk is heard in still more places.

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