As the G20 leaders prepare to conclude their meeting today, once again good news has had a half-life in the markets of less than 24 hours. Just as news of European plans to stand behind Spanish banks rallied markets and sentiment for only a few hours, a Greek election outcome that was as good as could have been hoped did not even buoy markets for a day. There could be no clearer evidence that the current strategy of vowing that the European system will hold together, addressing each crisis as it comes in the minimally sufficient way and vowing at every juncture to build a system that is sound in the long term has run its course.

Nor is the G20 likely to change anything, at least not immediately. The troubled European economies and their sympathizers will demand more emphasis on growth, lower interest rates on their official debts and more transfers. The Germans will show sympathy with the objective of reform but will insist that financial integration must coincide with political integration, noting that no one gives away a credit card without maintaining control over its use. And the rest of the world will express exasperation with Europe’s failure to get its act together and demand that more be done. Officials blessed with more diplomatic ability than economic insight or courage will produce a communiqué that politely expresses a measure of satisfaction with steps under way, recognizes the need to do more, and looks forward to continued coordination and dialogue. The only good thing is that expectations are so low that this is not likely to disappoint the markets very much.

The unfortunate truth is that European debtors and creditors are both right in their main lines of argument. The borrowers are right that austerity and internal devaluation have never been a successful growth strategy, certainly not in an environment where major trading partners are stagnating. The suggested counterexamples, where fiscal consolidations have preceded growth, involve either stagnation relative to previously attained levels of income (Ireland and the Baltics) or buoyant demand associated with surging export demand, increasing competitiveness and low borrowing costs (many euro members in the early years). They are also right in their claim that even a previously healthy economy will quickly become very sick if forced to operate for several years with interest rates far above growth rates, as is the case across Southern Europe. And experience is clear in suggesting that structural reform is always difficult and slow-acting but much more difficult when an economy is contracting and there is no sector to absorb those displaced by reform.

Those chary of institutionalizing financial integration without major political integration are right as well. A sound system must involve those with deep pockets who are on the hook for liabilities, either as borrowers or guarantors, having control over borrowing decisions. A system where I borrow and you repay is a prescription for unsustainable profligacy. This is why there is now so much discussion of eurobonds and Europe-wide deposit insurance being linked with much deeper political integration. But there are two problems that lie behind the soft references to greater integration. The first is the question of who really has control. If decisions are to be made on a genuinely euro-area basis, it is far from clear, especially after the French election, that there is any kind of majority or even plurality support for responsible policies. If the idea is that the euro area’s future will be on the ECB model – a European façade behind which Teutonic policies are pursued – it is far from clear that this will or should be acceptable across the continent.

The second is the magnitude of the transfers that could be involved: A good guess would be that during the U.S. savings and loan crisis the American southwest received a transfer equal to at least 20 percent of its GDP from the rest of the country. Is there a real will to commit to potential transfers of this magnitude in Europe? Maybe all of this can be resolved, but it will surely not happen quickly.

Not all problems can be solved. It is not certain that the full repayment of all currently contracted sovereign debts, sustainable growth for all, and maintenance of all nations currently on the euro will prove feasible. The private sector, through its actions, is making clear that it recognizes this painful reality. Official-sector planning needs to recognize it as well. Outside of Europe, even as leaders hope for the best, they need to plan for the worst, ensuring adequate liquidity and demand in their economies even if the European situation deteriorates rapidly. The fortification of the IMF is a start in the right direction, but consideration needs to be given to national policies, to trade finance and to social safety nets as well.