There's an extraordinary -- and extraordinarily depressing -- interview in Newsweek with Peer Steinbrueck, the Germany finance minister. The world economy is in a terrifying nosedive, visible everywhere. Yet Mr. Steinbrueck is standing firm against any extraordinary fiscal measures, and denounces Gordon Brown for his "crass Keynesianism."

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The reason is that the European economy is so integrated: European countries on average spend around a quarter of their GDP on imports from each other. Since imports tend to rise or fall faster than GDP during a business cycle, this probably means that something like 40 percent of any change in final demand "leaks" across borders within Europe. As a result, the multiplier on fiscal policy within any given European country is much less than the multiplier on a coordinated fiscal expansion. And that in turn means that the tradeoff between deficits and supporting the economy in a time of trouble is much less favorable for any one European country than for Europe as a whole.

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In short, there's a huge multiplier effect at work; unfortunately, what it's doing is multiplying the impact of the current German government's boneheadedness.