Losses arising from America’s housing recession could triple over the next few years and they represent the greatest threat to growth in the United States, one of the world’s leading economists has told The Times.

Robert Shiller, Professor of Economics at Yale University, predicted that there was a very real possibility that the US would be plunged into a Japan-style slump, with house prices declining for years. Professor Shiller, co-founder of the respected S&P Case/Shiller house-price index, said: “American real estate values have already lost around $1 trillion [£503 billion]. That could easily increase threefold over the next few years. This is a much bigger issue than sub-prime. We are talking trillions of dollars’ worth of losses.”

He said that US futures markets had priced in further declines in house prices in the short term, with contracts on the S&P Shiller index pointing to decreases of up to 14 per cent.

“Over the next five years, the futures contracts are pointing to losses of around 35 per cent in some areas, such as Florida, California and Las Vegas. There is a good chance that this housing recession will go on for years,” he said.

Professor Shiller, author of Irrational Exuberance, a phrase later [No. Earlier -- JH] used by Alan Greenspan, the former Federal Reserve chairman, said: “This is a classic bubble scenario. A few years ago house prices got very high, pushed up because of investor expectations. Americans have fuelled the myth that prices would never fall, that values could only go up. People believed the story. Now there is a very real chance of a big recession.”