Many economists, myself included, refer to the recent boom and bust in house prices as a bubble, whose foundation lay in a combination of credit market excesses and human imperfections. Fundamentals certainly played a role as well, but bubble forces were particularly important.
In a short paper recently published by the New York Federal Reserve, Jim Kahn makes a very different argument: that the boom and bust in house prices can largely be explained by a boom and bust in productivity growth:
The housing boom and bust of the last decade, often attributed to “bubbles” and credit market irregularities, may owe much to shifts in economic fundamentals. A resurgence in productivity that began in the mid-1990s contributed to a sense of optimism about future income that likely encouraged many consumers to pay high prices for housing. The optimism continued until 2007, when accumulating evidence of a slowdown in productivity helped dash expectations of further income growth and stifle the boom in residential real estate.
Jim’s argument depends on several related lines of reasoning:
- First, he notes that productivity drives long-term income growth and that incomes determine how much families can pay for homes. He then argues that the demand and supply for housing are inelastic and, as a result, rising incomes imply rising house prices. Putting these pieces together, he concludes that faster productivity growth implies faster house price appreciation.
- Second, he notes that productivity growth accelerated in the mid-to-late 1990s and then slowed around 2004. The productivity acceleration thus began shortly before house price took off, and the productivity slowdown began shortly before house prices began to collapse.

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