Word of the day: Hysteresis

Too long in a slump, and the slump starts to get permanent.

The Financial Times reports this morning that the Olympics don't seem to be leading to quite the tourist boom expected:

The games have attracted as many as 100,000 foreign visitors [per day] to London – more than in previous Olympics. But, on its own, that number significantly lags behind the estimated 300,000 foreign tourists [per day] who could be expected in a typical year.

As Richard Murphy points out, this means that one of the great hopes for bringing the country out of recession appears to be fading away. Which means the word of the day is hysteresis.

In general terms, hysteresis is similar to intertia; it is the concept that some things which are hard to get going may then require little input to maintain, and even more effort to reverse.

In specific economic terms, it is the theory that persistent levels of high unemployment raise the "natural" rate of unemployment, also known as NAIRU, the non-accelerating inflation rate of unemploymet. This is the level of unemployment at which, under neo-classical economics, inflation stays low and steady. (As a side-note, yes, neo-classical economics holds that a certain amount of unemployment is good. "Full employment" is thus a bad thing, because it leads to spiralling inflation)

Although it's not specifically related to GDP, it is always a fear when dealing with persistent unemployment and long periods of stagnation and recession. The cause of the phenomenon comes when layoffs in a particular sector increase the bargaining power of the remaining workers. as there are fewer of them left, they can demand higher wages, which become "sticky" in nominal terms, if the period of unemployment lasts long enough. If, at the end of the recession, the business then wants to hire new employees, they have to pay them the new, high wage. In practice, this means that either unemployment stays high permanently, or inflation goes up until the value of the high wage is back, in real tems, to where it was.

It doesn't look like we are seeing the "increased wages" part of the problem yet (since wages are very much stagnating), but that hasn't stopped Citigroup's Ajai Chopra warning everyone:

Our analysis of such hysteresis effects shows that the large and sustained output gap, the difference between what an economy could produce and what it is producing, raises the danger that a downturn reduces the economy’s productive capacity and permanently depresses potential GDP.

A street cleaner passes the Jobcentre Plus in Bath. Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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The New Statesman 2016 local and devolved elections liveblog

Results and analysis from elections across the United Kingdom. 

Welcome to the New Statesman's elections liveblog. Results will be coming in from the devolved legislatures in Scotland and Wales, local elections in England, and the mayoral contests in London, Salford, Bristol and Liverpool. Hit refresh for updates!

22:22: A few of you have been in touch about our exit poll. Most of you have been wondering about that one vote for George Galloway but the rest are wondering what happens - under the rules of the London mayoral race (and indeed the contests in Salford, Bristol and Liverpool), 2 votes would not be enough for Sadiq. (He needs 2.5). However, all the other candidates are tied - which makes it through to the second round. What happens then is the second preferences are used as a tie-break. Of the tied candidates, Sian Berry has the most second preferences so she goes through to face Sadiq Khan in the final round. Final round is as follows:

Sadiq Khan: 3

Sian Berry: 2

3 votes is above the quota so he is duly elected. An early omen? 

22:19: Burnham latest. A spokesperson for Andy Burnham says:

"Approaches have been made to Andy Burnham to give consideration to this role. It is early days and no decision as been taken. Whatever the decision, he will continue to serve the leader of the party and stay in the shadow cabinet."

22:17: Anyway, exit poll of the office. We've got:

Sadiq Khan: 2

George Galloway: 1

Caroline Pidgeon: 1

Sian Berry: 1

22:15: Update on Andy Burnham. He has been asked to consider running. More as we get it. 

22:13: People are asking if there's an exit poll tonight. Afraid not (you can't really do an exit poll in elections without national swing). But there is a YouGov poll from Wales and I am conducting an exit poll of the four remaining members of staff in the NS building. 

22:11: It's true! Andy Burnham is considering running for Greater Manchester mayor. Right, that's it, I'm quitting the liveblog. Nothing I say tonight can top that. 

22:09: Rumours that professional Scouser Andy Burnham is considering a bid for Greater Manchester mayor according to Sky News. Not sure if this is a) a typo for Merseyside or b) a rumour or c) honestly I don't know. More as I find out. 

22:06: Conservatives are feeling good about Trafford, one of the few councils they run in the North West.

22:03: Polls have closed. Turnout looks to be low in London. What that means is anyone's guess to be honest. There isn't really a particular benefit to Labour if turnout is high although that is a well-worn myth. In the capital in particular, turnout isn't quite as simple a zero-sum game as all that. Labour are buoyant, but so are the Tories. In Scotland, well, the only questions are whether or not the SNP will win every single first past the post seat or just the overwhelming majority. Both Labour and Tory sources are downplaying their chances of prevailing in the battle for second place at Holyrood, so make of that what you will. And in Wales, Labour look certain to lose seats but remain in power in some kind of coalition deal. 

22:00: Good evening. I'm your host, Stephen Bush, and I'll be with you throughout the night as results come in from throughout the country. The TV screens are on, I've just eaten, and now it's time to get cracking. 

Stephen Bush is special correspondent at the New Statesman. He usually writes about politics.