A bubble in the American housing market was the catalyst for today's financial market turbulence. But the bubble was not confined to the United States.

In Europe, house prices have also increased sharply over the last decade – more dramatically than in the US in many cases.

Indeed, with a few exceptions, housing prices have risen almost everywhere to levels never seen before. How could such a global pattern emerge when real estate is the most local of all assets?

Over the last three decades, prices in the US and Europe have tended to follow three slow-moving, related boom-bust cycles. All previous peaks were followed by several years of declining prices. There is no reason to assume that this cycle will be any different.

Since last year, prices have declined in the US. If the past pattern holds, house prices should start to fall very soon in Europe as well. The prices will probably have to fall at least by 20-30 percent, but possibly considerably more before they find a bottom.

European policy makers thus have cause for concern. While there is little evidence in the Euro area of large-scale subprime lending, there is considerable evidence to suggest that house prices have an important impact on domestic demand, albeit with wide variations among individual countries.

Almost everywhere, higher house prices have been associated with strong consumption. Lower house prices throughout Europe are thus likely to be accompanied by weaker consumption demand, as in the US. In Germany, for example, house prices have remained relatively low and consumption weak.

The impact of house prices on construction activity has been more varied. In Spain and Ireland, construction investment has increased to a level far above that of the US and not seen in any other OECD country except Japan before its bubble burst in 1989.

In these two countries, lower housing prices are likely to be associated with a sharp and prolonged drop in domestic demand, which should be stronger even than what can be expected in the US.

By contrast, in France and Italy, where house prices have increased almost as much as in the US, there is no evidence of a housing overhang. The negative impact of a downturn in housing prices in these two countries should thus be limited to a drop in consumption. Germany should be affected the least because both house prices and construction activity have been below trend for some time.

In short, the downturn in house prices will not be limited to the US. And, on both sides of the Atlantic, that decline is likely to undermine consumer spending.

(China Daily February 27, 2008)