But there’s a deeper problem: Europe’s economic and monetary integration has run too far ahead of its political institutions. The economies of Europe’s many nations are almost as tightly linked as the economies of America’s many states  and most of Europe shares a common currency. But unlike America, Europe doesn’t have the kind of continentwide institutions needed to deal with a continentwide crisis.

This is a major reason for the lack of fiscal action: there’s no government in a position to take responsibility for the European economy as a whole. What Europe has, instead, are national governments, each of which is reluctant to run up large debts to finance a stimulus that will convey many if not most of its benefits to voters in other countries.

You might expect monetary policy to be more forceful. After all, while there isn’t a European government, there is a European Central Bank. But the E.C.B. isn’t like the Fed, which can afford to be adventurous because it’s backed by a unitary national government  a government that has already moved to share the risks of the Fed’s boldness, and will surely cover the Fed’s losses if its efforts to unfreeze financial markets go bad. The E.C.B., which must answer to 16 often-quarreling governments, can’t count on the same level of support.

Europe, in other words, is turning out to be structurally weak in a time of crisis.

The biggest question is what will happen to those European economies that boomed in the easy-money environment of a few years ago, Spain in particular.

For much of the past decade Spain was Europe’s Florida, its economy buoyed by a huge speculative housing boom. As in Florida, boom has now turned to bust. Now Spain needs to find new sources of income and employment to replace the lost jobs in construction.

In the past, Spain would have sought improved competitiveness by devaluing its currency. But now it’s on the euro  and the only way forward seems to be a grinding process of wage cuts. This process would have been difficult in the best of times; it will be almost inconceivably painful if, as seems all too likely, the European economy as a whole is depressed and tending toward deflation for years to come.