The OBR's fiscal outlook in five charts

The OBR looked at fiscal sustainability today. Here's what they found.

Forecasting is hard

Page 106, thanks to Ed Conway

I'll admit, I have an idiosyncratic sense of humour. But still, I laughed out loud at this tangle of lines, which shows the OBR's best attempts to forecast oil and gas revenues. It's reminiscent of the woefully optimistic IMF forecasts for Greek GDP, excel that instead of being consistently wrong in the same direction, it's more like a child just scribbled a lot of lines on the chart.

Unfortunately, the oil and gas revenues remain important. Thanks to the long-standing decline in productivity in the sector, a function of the drying-up of North Sea oil fields, it usually imparts a massive downward pressure on the quarterly GDP figures, which means that getting the predictions accurate is crucial for getting the overall figure accurate.

Migration saves us money

Page 147, thanks to Jonathan Portes

If you care about public sector debt, really the absolute best thing you can do is remove restrictions on migration. Migrants are educated by their home country, and frequently retire there too; in the meantime, they work hard, pay their taxes, and have a lower-than-average crime rate.

The "high migration" scenario is of the average net migration being slightly more than double what the ONS uses as its baseline assumption, with 260,000 people coming in on net compared to 140,000. That's a lot more than normal, but it's not outside the realm of political possibility. Just think what a fully open-borders policy could do for the national accounts…

At the other end, the ONS looks at what "zero net migration" would do. Remember that zero net migration is actually the government's explicit policy, so it's already a bit damning that the ONS instead works on the assumption that they will fail to hit it by 140,000 people. But when we look at the stats, it's clear that we should be glad of that. Zero net migration would push the debt:GDP ratio over 100 per cent by 2050.

Young people and old people cost money

Page 78, thanks to Chris Giles

Again, nothing which will blow your mind: the state spends money educating young people, caring for old people, and providing health services to both, while the people in the middle pay the bills. What's interesting are the two crossover points – roughly 23 and 67 years old – where people go from being, on average, a contributor to a benefactor or vice versa, as well as the curious level of the peak of tax contributions, at just under 50.

You are never going to retire

Page 117

The thick line is the OBR's best guess of what changes to the pension age are going to do to the proportion of people between 65 and 74 working: around a 66 per cent increase, to just over a quarter of those people working by 2045. That already comes after a doubling of the rate in the last twenty years:

We are never ever ever getting time off work.

This is all just guesswork

Page 11

Finally, an important reminder that the long-term projections are as vague as can be. In fact, discussing them in terms of fiscal policy is almost nonsensical. What they are instead is predictions of demographic change mapped on to current policy. So if the nation continues ageing as it looks like it will be, and if we fail to do reform the state pension in that time, then the national debt will start rising on current policies in 2037.

Obviously, it's nonsense to act as though all our policies will be the same in 2017, let alone 20 years after that, but it's the only way talk about the future at all.

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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Jeremy Corbyn fares well in his toughest interview yet

Labour will be relieved that Corbyn's encounter with Andrew Neil was less painful than Theresa May's. 

Jeremy Corbyn's half-hour BBC1 interview with Andrew Neil was the toughest grilling he has faced since becoming Labour leader. Neil sought to cause Corbyn maximum discomfort by confronting him with his past views on the IRA, NATO and Trident (which he never anticipated having to defend from his current position). 

"I didn't support the IRA, I don't support the IRA," Corbyn said in response to the first. After Neil countered that Corbyn "invited convicted IRA terrorists to tea in the Commons a few weeks after the Brighton bomb," the Labour leader replied: "I never met the IRA. I obviously did meet people from Sinn Fein" (a distinction without a difference, some will say). But after the 1998 Good Friday Agreement, Corbyn is aided by the reduced toxicity of the subject (New Labour dealt with terrorists) and the fact that for some voters, the young most of all, "the troubles" are a distant memory.

NATO, Neil recalled, had been described by Corbyn as "'a very dangerous Frankenstein of an organisation', 'a danger to world peace'. Two years ago you said it should be 'wound up'." It is to Corbyn's credit, in some respects, that he struggles to disguise his sincere views, and he did on this occasion. "NATO exists," he observed at one point, eventually conceding after much prodding: "I will be a committed member of that alliance in order to promote peace, justice, human rights and democracy". But nearly 30 years after the end of the Cold War, the subject will seem esoteric to many voters.

Trident, however, is another matter. "My views on nuclear weapons are well-known," Corbyn correctly noted, making it clear that the Labour manifesto committed to full renewal against his wishes. "I voted against the renewal," he said. "Everybody knows that because I wanted to go in a different direction." That the opposition is divided on such a profound issue - and that Corbyn's stance is at odd with the electorate's - is undoubtedly a drag on Labour's support.

But under forensic examination, Corbyn emerged stronger than many predicted. There were few moments of intemperance and no disastrous gaffes. Corbyn successfully dodged a question on whether Labour would cut immigration by replying that the numbers would "obviously reduce" if more workers were trained. Indeed, compared with Theresa May's painful encounter with Neil last Monday, Corbyn's team will be relieved by his performance. Though the Labour leader cannot escape his past, he avoided being trapped by it tonight. 

George Eaton is political editor of the New Statesman.

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