We knew the euro was a bad idea in 1961. What went wrong?

The eurozone is emphatically not an optimal currency area.

Everyone knows this action-movie story: a heroic, war-scarred veteran is promoted to a prestigious desk job, reluctantly hanging up his rifle in the process. But then the state finds itself under threat and his superiors in the bureaucracy turn out to be grossly inept. Eventually, our hero, fearing for the lives of his men and the good of the country, tells them where they can stuff their desk job, picks up his rifle and leads the troops to an epic victory.

The start of this tale is similar to what has been playing out in the Eurozone over the past decade. Countries, hoping to join the safety, prosperity and exclusivity of the Eurozone, readily hung up their weapons of monetary policy, fiscal flexibility and money-printing. But now they need them again, and they're nowhere to be found.

The dangers of currency unions are not only now emerging: they have been a central part of international macroeconomics literature for over half a century, since Robert Mundell’s seminal paper (£) on "Optimal Currency Areas" (OCAs) in 1961.

What seems to have shocked the Eurogenitors is that this longstanding theory was actually right.

OCA theory highlights the costs and benefits of common currency zones and suggests criteria that all states should satisfy before considering their formation. Benefits include increased intra-zone trade, lowered transaction/conversion costs and increased competition through price transparency, while Costs are mainly concerned with lost flexibility. Countries in the zone no longer have the ability to adjust to asymmetric shocks, whether by externally devaluing via currency pr internally devaluing via inflation.

So, could we use OCA theory to retrospectively solve the Eurozone’s problems?

Sadly not. First, many of the criteria which Europe does not meet – hence the original incompatibility – can never be met by it. And second, the Eurozone has created new problems that OCA theory never envisaged. What started as asymmetric shocks – a banking crisis and property bubble bust – have become a massive symmetric attack across the whole region as unarmed sovereigns are left with no policies to defend themselves whilst their very solvency is called into question.

A good example of the Eurozone’s economic incompatibility can be found in Mundell’s first classic OCA criterion: labour mobility. This represents one of the most marked differences between US states and Eurozone countries. If unemployment rises in Detroit – say, because demand for cars falls – workers can move to a state where there is more demand for work, easing Detroit’s unemployment. And Americans do move, frequently. The same is not true of Europe, partly because of the heterogeneity of labour markets but mainly due to culture and, most importantly, language.

So, would a solution to the Euro crisis be to teach everyone, say, German? Despite the obvious historical faux pas of imposing Deutsche Uber Alles, this would raise employment in the short run for Germans (as teachers) – the opposite of what is needed. Teaching English is out for the same reason, and besides, anything that promotes the meddling Brits would be shot down by the Europeans at the helm.

So, how about Spanish? Great idea. Youth unemployment in Spain is a whopping 52 per cent, and teaching your native language requires only a short course that the indignados could pick up in a few weeks. Eurozone-backed free Spanish lessons would ease unemployment (and the associated social benefits) in Spain, whilst the increased skills would further knowledge transfer across the continent and allow for better trade and business links with the fast-growing economies of South America as well as the US (over 10 per cent of the population are Hispanophones).

But of course this is folly. The Italians/Greek/Portuguese would ask, "why not us"? The French would be furieux; to many French diplomats, the very raison d’être of the European project was to spread the French language in defiance of English. They are not about to sponsor an attack on their langue maternelle from over the Pyrenees or anywhere else.

In fact, try though we might to come up with ingenious solutions, microeconomic reforms will not save the Eurozone. No matter what language you put it in, investors can see the current crisis for what it really is: a vote of no confidence in the currency itself.

But OCA theory may have one last bullet in the chamber. Another founding father of OCA theory, Peter Kenen, highlighted in a 1969 paper the need for fiscal integration.

For example, a demand shock in Detroit would not cause a fundamental questioning of the dollar. Instead, Washington would increase transfers to Motor City to allow it to rebalance without cutting state-level consumption and the Treasury would continue to borrow at low rates reflecting the might of the US economy as a whole.

Joining the Euro for many countries has meant surrendering their economic self-determination even while the bazooka-holding Germans have ignored the pressing need for action in the on-going war of attrition against their shared currency.

The Banking Union agreed to on June 27th may sever the link between insolvent banks and insolvent governments but the risk to the currency remains, and thus the unsustainable borrowing costs for peripheral countries will continue.

Everyone can see what Germany’s role in this tale is: either agree to fiscal integration, debt mutualisation and a genuine guarantee of the currency (the markets will know otherwise) or unlock the arsenal, give the Eurozone countries back their self-determination and bring the project to its conclusion.

The story of the European project has been one of peace, prosperity and co-operation for decades, but it is time the next chapter was written.

Robert Mundell, who knew the euro was a bad idea fifty years ago. Photograph: Getty Images

Dom Boyle is a British economist.

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Labour's establishment suspects a Momentum conspiracy - they're right

Bernie Sanders-style organisers are determined to rewire the party's machine.  

If you wanted to understand the basic dynamics of this year’s Labour leadership contest, Brighton and Hove District Labour Party is a good microcosm. On Saturday 9 July, a day before Angela Eagle was to announce her leadership bid, hundreds of members flooded into its AGM. Despite the room having a capacity of over 250, the meeting had to be held in three batches, with members forming an orderly queue. The result of the massive turnout was clear in political terms – pro-Corbyn candidates won every position on the local executive committee. 

Many in the room hailed the turnout and the result. But others claimed that some in the crowd had engaged in abuse and harassment.The national party decided that, rather than first investigate individuals, it would suspend Brighton and Hove. Add this to the national ban on local meetings and events during the leadership election, and it is easy to see why Labour seems to have an uneasy relationship with mass politics. To put it a less neutral way, the party machine is in a state of open warfare against Corbyn and his supporters.

Brighton and Hove illustrates how local activists have continued to organise – in an even more innovative and effective way than before. On Thursday 21 July, the week following the CLP’s suspension, the local Momentum group organised a mass meeting. More than 200 people showed up, with the mood defiant and pumped up.  Rather than listen to speeches, the room then became a road test for a new "campaign meetup", a more modestly titled version of the "barnstorms" used by the Bernie Sanders campaign. Activists broke up into small groups to discuss the strategy of the campaign and then even smaller groups to organise action on a very local level. By the end of the night, 20 phonebanking sessions had been planned at a branch level over the following week. 

In the past, organising inside the Labour Party was seen as a slightly cloak and dagger affair. When the Labour Party bureaucracy expelled leftwing activists in past decades, many on went further underground, organising in semi-secrecy. Now, Momentum is doing the exact opposite. 

The emphasis of the Corbyn campaign is on making its strategy, volunteer hubs and events listings as open and accessible as possible. Interactive maps will allow local activists to advertise hundreds of events, and then contact people in their area. When they gather to phonebank in they will be using a custom-built web app which will enable tens of thousands of callers to ring hundreds of thousands of numbers, from wherever they are.

As Momentum has learned to its cost, there is a trade-off between a campaign’s openness and its ability to stage manage events. But in the new politics of the Labour party, in which both the numbers of interested people and the capacity to connect with them directly are increasing exponentially, there is simply no contest. In order to win the next general election, Labour will have to master these tactics on a much bigger scale. The leadership election is the road test. 

Even many moderates seem to accept that the days of simply triangulating towards the centre and getting cozy with the Murdoch press are over. Labour needs to reach people and communities directly with an ambitious digital strategy and an army of self-organising activists. It is this kind of mass politics that delivered a "no" vote in Greece’s referendum on the terms of the Eurozone bailout last summer – defying pretty much the whole of the media, business and political establishment. 

The problem for Corbyn's challenger, Owen Smith, is that many of his backers have an open problem with this type of mass politics. Rather than investigate allegations of abuse, they have supported the suspension of CLPs. Rather than seeing the heightened emotions that come with mass mobilisations as side-effects which needs to be controlled, they have sought to joins unconnected acts of harassment, in order to smear Jeremy Corbyn. The MP Ben Bradshaw has even seemed to accuse Momentum of organising a conspiracy to physically attack Labour MPs.

The real conspiracy is much bigger than that. Hundreds of thousands of people are arriving, enthusiastic and determined, into the Labour party. These people, and their ability to convince the communities of which they are a part, threaten Britain’s political equilibrium, both the Conservatives and the Labour establishment. When the greatest hope for Labour becomes your greatest nightmare, you have good call to feel alarmed.