Think of it this way: private demand in the debtor countries has plunged with the end of the debt-financed boom. Meanwhile, public-sector spending is also being sharply reduced by austerity programs. So where are jobs and growth supposed to come from? The answer has to be exports, mainly to other European countries.

But exports can’t boom if creditor countries are also implementing austerity policies, quite possibly pushing Europe as a whole back into recession.

Also, the debtor nations need to cut prices and costs relative to creditor countries like Germany, which wouldn’t be too hard if Germany had 3 or 4 percent inflation, allowing the debtors to gain ground simply by having low or zero inflation. But the European Central Bank has a deflationary bias — it made a terrible mistake by raising interest rates in 2008 just as the financial crisis was gathering strength, and showed that it has learned nothing by repeating that mistake this year.

As a result, the market now expects very low inflation in Germany — around 1 percent over the next five years — which implies significant deflation in the debtor nations. This will both deepen their slumps and increase the real burden of their debts, more or less ensuring that all rescue efforts will fail.

And I see no sign at all that European policy elites are ready to rethink their hard-money-and-austerity dogma.

Part of the problem may be that those policy elites have a selective historical memory. They love to talk about the German inflation of the early 1920s — a story that, as it happens, has no bearing on our current situation. Yet they almost never talk about a much more relevant example: the policies of Heinrich Brüning, Germany’s chancellor from 1930 to 1932, whose insistence on balancing budgets and preserving the gold standard made the Great Depression even worse in Germany than in the rest of Europe — setting the stage for you-know-what.

Now, I don’t expect anything that bad to happen in 21st-century Europe. But there is a very wide gap between what the euro needs to survive and what European leaders are willing to do, or even talk about doing. And given that gap, it’s hard to find reasons for optimism.