When will the housing bubble burst?

House prices are still creeping up. And the state of the property market is even more perilous than it seems, says James Ferguson

Here's a question from the Harvard College Bowl, a sort of Harvard University in-house version of the BBC's long-running University Challenge: "Typically one expects that as the price of a good goes up, the demand for it goes down, but an economist noted an interesting violation of this rule during the Irish famine. When the price of potatoes went up, the number of potatoes bought increased because potatoes were still the cheapest staple, but their increase in price took up the discretionary income that used to allow people to indulge in food other than potatoes. For 25 points, what name is given to a good when the demand for it increases despite a price rise?"

Answer: a Giffen' good. Giffen goods are among the most rare and obscure theories in modern economics, yet we may well be living with an example of one right now. You may even have bought one recently yourself. I'm talking about UK houses.

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James Ferguson qualified with an MA (Hons) in economics from Edinburgh University in 1985. For the last 21 years he has had a high-powered career in institutional stock broking, specialising in equities, working for Nomura, Robert Fleming, SBC Warburg, Dresdner Kleinwort Wasserstein and Mitsubishi Securities.