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The authors come up with a variety of numbers, including one that has received a lot of attention: potential G.D.P.—broadly speaking, the level of G.D.P. consistent with stable inflation—“is currently about 7 percent below the trajectory it appeared to be on prior to 2007.” According to the latest figures from the Commerce Department, the G.D.P. is now close to seventeen trillion dollars, and seven per cent of that figure is $1.2 trillion. This is a lot of money to have gone missing, especially if it will never be recovered. Hence Krugman’s dire conclusion: “By tolerating high unemployment we have inflicted huge damage on our long-run prospects …. What passes these days for sound policy is in fact a form of economic self-mutilation, which will cripple America for many years to come.”

As well as figuring out the current level of potential G.D.P., the authors estimate its growth rate. This is the more important figure, because it’s what determines living standards over the long term

In the nineteen-eighties, Larry Summers and Olivier Blanchard, who is now the chief economist of the I.M.F., resurrected the idea and gave it a new name, which they borrowed from engineering: hysteresis. Blanchard and Summers examined hysteresis in Europe, where high rates of unemployment have long been a problem.

The good news is that things aren’t quite as bad as the figures in the Fed paper might suggest. If we can get policy right and sharply increase the level of over-all demand in the economy, most of the damage done in the past five years is reversible.

At the moment, sadly, there is no prospect of any more fiscal stimulus, let alone a war-sized one, and the onus is falling on the Fed to gee up the economy.

Central banks that buy sovereign debt issued by fiscal authorities offset market-imposed discipline on borrowing costs, effectively subsidizing public-sector profligacy.

Zombie-like companies were kept on artificial life-support in the false hope that time alone would revive them. It was not until late in the decade, when the banking sector was reorganized and corporate restructuring was encouraged,

Like Japan, America’s post-bubble healing has been limited – even in the face of the Fed’s outsize liquidity injections. Household debt stood at 112% of income in the third quarter of 2012 – down from record highs in 2006, but still nearly 40 percentage points above the 75% norm of the last three decades of the twentieth century. Similarly, the personal-saving rate, at just 3.5% in the four months ending in November 2012, was less than half the 7.9% average of 1970-99.

Crisis-torn peripheral European economies still suffer from unsustainable debt loads and serious productivity and competitiveness problems. And a fragmented European banking system remains one of the weakest links in the regional daisy chain.

That leaves a huge sum of excess liquidity sloshing around in global asset markets. Where it goes, the next crisis is inevitably doomed to follow.

Meanwhile, the share of coal – the dirtiest fuel – has been rising, not falling, in the rest of the world’s energy mix.

Put differently, if the world continues to build coal-fired power plants at the current rate, those plants will still be around in 2050, regardless of what other technologies become viable in the meantime.

Even a serious fracking mishap would be unlikely to cause as much damage as the Deepwater Horizon oil spill in 2010, the Fukushima nuclear catastrophe in 2011, or coal-mining tragedies that play out dramatically in frequent explosions and collapses (and more insidiously in the form of lung disease, water pollution, and soil erosion).

The crisis is almost entirely self-inflicted. It has the quality of a nightmare.

My interpretation of the euro crisis is very different from the views prevailing in Germany. I hope that by offering you a different perspective I may get you to reconsider your position before more damage is done. That is my goal in coming here.

For instance, the Maastricht Treaty took it for granted that only the public sector could produce chronic deficits because the private sector would always correct its own excesses. The financial crisis of 2007-8 proved that wrong.

Only at the end of 2009, when the extent of the Greek deficit was revealed, did the financial markets realize that a member country could actually default. But then the markets raised the risk premiums on the weaker countries with a vengeance.

Then the IMF and the international banking authorities saved the international banking system by lending just enough money to the heavily indebted countries to enable them to avoid default but at the cost of pushing them into a lasting depression. Latin America suffered a lost decade.

In effect, however, the euro had turned their government bonds into bonds of third world countries that carry the risk of default.

he fact that Greece blatantly broke the rules has helped to support this attitude. But other countries like Spain and Ireland had played by the rules;

As soon as the pressure from the financial markets abated, Germany started to whittle down the promises it had made at the height of the crisis.

Losing the privilege of issuing eurobonds and having to pay stiff risk premiums would be a powerful inducement to stay in compliance.

There are also widespread fears that eurobonds would ruin Germany's credit rating. eurobonds are often compared with the Marshall Plan.

They would survive on limited support from European Structural Funds and remittances

For example, in November 2011, interest rates on Italian sovereign bonds were around 8% all along the curve, even as the government faced refinancing needs totaling nearly 30% of GDP over the following year. Because debt monetization was not an option, austerity had to ensue at that point, regardless of what Merkel – or anyone else – had to say.

Southern countries, still largely in denial, should accept the need for deeper, competiveness-enhancing reforms. Germany and its allies, for their part, should accept that running high external surpluses is damaging the eurozone and themselves, and that it is time for them to put part of their huge excess savings to work to support growth.

Maybe Draghi’s policies can buy time for deeper “structural changes” in the periphery, although quite what those are and what difference they would make in the near term remains elusive

More likely, a shift in ECB policies would make the European situation uglier. For one, Draghi would essentially be conceding fiscal dominance, demonstrating that if governments run budget deficits, they can count on the central bank to finance them.

Perhaps Draghi is planning the same game with fiscal authorities that the Banca d’Italia used to play with Italian politicians in the 1980s and early 1990s -- keep interest rates low enough to prevent fiscal collapse, yet high enough to keep fiscal prudence as a priority. Make no mistake about it, inflation or not, this is a strategy of high real interest rates.

Mr Rogoff said Europe is squandering the "scarce resource" of its youth, badly needed to fortify an ageing society as the demographic crunch sets in.

"If these latent technologies are not realised, Europe will wake up like Rip Van Winkel from a long Japan-like slumber to find itself a much smaller part of the world economy, and a lot less important."

Mr Rogoff said debt write-downs across the EMU periphery "will eventually happen" but the longer leaders let the crisis fester with half-measures, the worse damage this will do to European society in the end.

Sir Martin said the eurozone is pursuing a reverse "Phillips Curve" - the trade off between jobs and inflation - as if it were testing "what level of unemployment it is prepared to tolerate for zero inflation".

Pierre Nanterme, chairman and chief executive officer of Accenture, said Europe is losing the great battle for competitiveness, and risks a perma-slump where debt burdens of 100pc of GDP prevent governments breaking free by investing in skills and technology.

He said Europe is falling further behind as the US basks in cheap energy and pours funds into cutting-edge technology. "A lot is at stake. If in 12 to 24 months no radical steps are taken to break the curse, we might have not just five, ten, but twenty years of a low-growth sluggish situation in Europe," he said.

"People are no longer talking about the euro falling apart but youth unemployment is really horrific. They can't leave this twisting in wind for another five years," he said