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These countries have to do what they need to do. There’s no question there has to be fiscal consolidation. We can discuss the pace, but it has to happen. The other is competitiveness, which I see as much tougher of the two.

Take the big two, Italy and Spain. You can always dream of more, but I think they’re serious about doing it, both on the fiscal front and the structural-reforms front. I think it may well be that even if they do everything they can, and do it right, it’s still not enough. They have to have help — I would say when needed rather than if needed.

It’s not that I don’t care about the way it’s done. But I care about the result. These countries, if they’re doing the right things, they have to be able to finance themselves.

Some people say a euro depreciation would help Europe a lot. I think there is an argument for it, even in a multilateral context. You have to depreciate vis-a-vis somebody, so somebody has to appreciate. My sense is we would like most of the depreciation to be vis-a-vis emerging-market countries. Even if there was a depreciation vis-a-vis the dollar, I still think it would be a good thing.

“One of the best management techniques for controlling Goss’s wilt is crop rotation — corn, then soy or another crop,” Mr. Anderson said.

nother possible factor is the growth of no-till farming, which leaves cornstalks, on which the bacteria can linger, to decay in the field after harvesting, rather than being plowed under.

Such a business “typically possesses some combination of a number of key attributes, among them the capability to raise finance for large new projects and the resources necessary to fund a high level of research and development spending to sustain technological leadership, to develop a global brand, to invest in state-of-the-art information technology and to attract the best human resources”.

Moreover, “one hundred giant firms, all from the high-income countries, account for over three-fifths of the total R&D expenditure among the world’s top 1,400 companies. They are the foundation of the world’s technical progress in the era of capitalist globalisation”.

This creates growing tension, as governments find “their” companies ever harder to tax or regulate.

Why should Japanese politicians risk infuriating their farmers when any agreement can be torn up on Capitol Hill?

Europe’s leaders will now doubt America’s commitment, given how feebly Mr Obama has fought for fast-track. Trade sceptics, such as French farmers, are drooling. Angela Merkel, Germany’s chancellor, who is already furious about American spying, may decide that a trade deal is not worth battling for.

He seldom mentions, for example, that cheap imports help the poor by cutting their shopping bills, and so reduce inequality of consumption.

Think of the story of the real-estate boom in the United States and other countries in the first half of the 2000’s. This was a story not of a “bubble”; rather, the boom was a triumph of capitalist enterprise in a new millennium.

These stories were so powerful because a huge number of people were psychologically – and financially – invested in them

With the abrupt end of the boom in 2006, that ego-boosting story also ended.

To understand why economic recovery (if not that of the stock market) has remained so weak since 2009, we need to identify which stories have been affecting popular psychology.

Externalities do not fix themselves. In the absence of effective individual property rights they require government action, in this case the action of close to 200 governments.

Why should they do this? The answer is: because a low-carbon atmosphere is a global public good.

It is by now impossible to be optimistic that anything like this will happen. This is partly because the needed agreement must be long-term and global. That, in turn, raises difficult questions of intragenerational and intergenerational equity.

Suppose that, despite all the logic, it proves impossible to achieve a relevant global agreement. Does it make sense for any country or group of countries to take determined action on their own? If the aim is to deal with climate change, the answer is: absolutely not, unless the countries are China or the US.

But it might be possible for a country to demonstrate proof of concept:

It should have been obvious that the debtor countries could get into payment difficulties as they were piling up debt made possible by the loans of German banks.

If there is a breakup of the Eurozone, Germany will face the risk that some debtor countries default on their debt. But again this risk is not affected by the size of the TARGET2 claims of Germany.

Since 2009, when the TARGET2 balances started to take off, current account deficits of the peripheral countries as a whole declined from 9.1% of their GDP to 4.5%. These declines were mainly due to deep recessions in these countries.

The main reason why German TARGET2 claims have increased so much since 2010 is capital flows. The flows have taken two forms.

The first one came about when German banks unloaded their loans made to peripheral countries into the balance sheet of the Bundesbank.

Thus in the scenario of a breakup, with or without TARGET2 claims, the risk of large losses for the German taxpayer is very similar.

the Bundesbank can eliminate the risk of such last minute accumulations of TARGET2 balances by converting euros into new German marks only for German residents.

One aim of the exercise is to identify the bad debts that are fouling up euro-zone banks and preventing the flow of new credit. This is important because parts of the single-currency area are crippled not just by public borrowing but by private debt, most of which is sitting on banking books.

High private debt is more detrimental to growth than high public debt, according to recent research by the IMF.

Other balance-sheet indicators also suggest that Italian business is in a bad way. For example, 30% of corporate debt is owed by firms whose pre-tax earnings are less than the interest payments they have to make. That share of frail companies is even higher in Spain and Portugal (40% and nearly 50% respectively).

Little progress has been made to lighten the private-debt burden since the crisis began. Though it eased in Spain from 227% of GDP in 2009 to 215% in 2012, it rose over the same period in Cyprus, Ireland and Portugal. In Britain, by contrast, private debt fell from 207% of GDP in 2009 to 190% in 2012 thanks to improvements by both households and firms.

Firms that have overborrowed are reluctant to embark on new ventures, and banks are in any case reluctant to lend because their balance-sheets are peppered with bad debts. This unhappy state of affairs prevails throughout southern Europe though its precise causes vary.

“He’s helping us think about what is one of the greatest challenges of our time, how to deal with what feel like friendly monopolists,” said Tim Wu, a Columbia Law School professor who studies Internet policy and antitrust. “Amazon, Google and the others give us all this stuff for free or lower prices, so we love them, but are they dangerous in ways we don’t always see?”

In the 2002 paper with Jean-Charles Rochet, Mr. Tirole defined two-sided markets, or markets that “get both sides on board” by charging more to one set of customers in order to increase demand by others.

In the tech industry, it explains why Google, Facebook and Twitter offer their services free – the more people who use them, the more advertisers they can attract. Likewise, Amazon lowered the price of its new phone to 99 cents in part because smartphones succeed when they have a lot of apps – and developers won’t want to build apps for Amazon’s phone unless a lot of people are using it.

For regulators, tech companies have been a riddle in part because they do not follow the behavior of typical monopolies: Many do not charge for their products, and companies that offer entirely different products are nonetheless competitors. For instance, Google’s chairman, Eric Schmidt, argued in a speech on Monday that Google’s biggest competitor in search is Amazon and in mobile is Facebook — even though neither one is a search engine.

For consumers, the costs include absorbing advertisers’ ad spending by paying more for their products, being tracked and shown personalized ads, and giving up privacy.

our end-users do not internalize the impact of their purchase on the other side of the market.”

The ECB’s Outright Monetary Transactions programme was instrumental in reducing Spanish government bond yields. This alleviated the Spanish fiscal position, but did not make it sustainable. The continuing unsustainability of the Spanish government debt has to do with two factors: First while r (the interest rate) declined, g (nominal growth) remained much lower in Spain than in the UK. The latter was due to the deflationary forces in the Eurozone – themselves a result of excessive austerity and the absence of currency depreciation (which was made possible in the UK thanks to the expansionary monetary policies of the Bank of England).

The best guess is that France will yet again get its way,

France and Europe More special pleading

But three years later, the same row erupted again: Gazprom demanded a price hike to $400-plus from $250, Kiev flatly refused, and on New Year's day 2009, Gazprom began pumping only enough gas to meet the needs of its customers beyond Ukraine.

Again, the consequences were marked. Inevitably, Russia accused Ukraine of siphoning off supplies meant for European customers to meet its own needs, and cut supplies completely

several countries – particularly in south-eastern Europe, almost completely dependent on supplies from Ukraine – simply ran out of gas.

Bulgaria shut down production in its main industrial plants; Slovakia declared a state of emergency

Many industry experts, though, point out that the world has changed since 2009, and that there are any number of reasons why Moscow's natural gas supplies may not prove quite the potent economic and diplomatic weapon they once were.

higher than normal temperatures are forecast to continue for several weeks yet, significantly reducing demand for gas and leaving prices at their lowest for two years

since the first "gas war" of 2006, many European countries have made huge efforts to increase their gas storage capacity and stocks are high. Some countries, such as Bulgaria, Slovakia and Moldova, which lack large storage capacity and depend heavily on gas supplies via Ukraine, would certainly suffer from any disruption in supplies

New Gazprom pipelines via Belarus and the Baltic Sea to Germany (Nord Stream) have cut the proportion of Gazprom's Europe-bound exports that transit via Ukraine to around half the total, meaning only about 15% of Europe's gas now relies on Ukraine's pipelines. Gazprom is also planning a Black Sea pipeline (South Stream), expected in 2015, meaning its exports to Europe will bypass Ukraine completely. Ukraine itself has cut its domestic gas consumption by nearly 40% over the past few years, halving its imports from Russia in the process.

Europe is increasingly installing specialist terminals that will allow gas to be imported from countries such as Qatar in the form of liquefied natural gas – while Norway's Statoil sold more gas to European countries in 2012 than Gazprom did. "Since the Russian supply cuts of 2006 and 2009, the tables have totally turned," Anders åslund, an energy advisor to both the Russian and Ukrainian governments, told the Washington Post.

Europe accounts for around a third of Gazprom's total gas sales, and around half of Russia's total budget revenue comes from oil and gas. Moscow needs that source of revenue, and whatever Vladimir Putin's geo-political ambitions, most energy analysts seem to agree he will think twice about jeopardising it.