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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Chuka Umunna: Why tolerance is not enough

Against the Trumpification of politics.

It’s still spring, yet 2016 already stands out as one of the ugliest years in modern British political history. It was fantastic to see Londoners choosing hope over fear in May, electing Sadiq Khan as our first Muslim mayor. But David Cameron, having shamelessly endorsed Zac Goldsmith’s dog-whistle campaign tactics, owes those young Muslims who have been put off politics by the slurs hurled at Khan an explanation. How does racial profiling and sectarian scaremongering fit into his One Nation vision for Britain?

Meanwhile, Boris Johnson, one of the best bets to succeed Cameron as our next prime minister, embarrassed Britain on the world stage with a racially charged allusion to Barack Obama’s Kenyan heritage. And my own party has been grappling with a swath of deeply disturbing revelations regarding the attitudes held by some on the left towards Israel and Jewish people. Sowing discord by stigmatising or scapegoating a single faith group or community is profoundly at odds with the British tradition of “tolerance”, but we can’t ignore that this year’s events are part of a rising trend of friction and factionalism.

Last year’s general election should have been a wake-up call. The political and cultural divides between people living in the north and south and urban and rural areas – as well as between working-class and metropolitan sensibilities – appear starker than ever. In May’s devolved elections, Scottish, Welsh and Northern Irish politics became yet more distinct – giving the impression of a kingdom coming apart at the seams. All the while, more and more voices in our national politics seek to pin the blame for the challenges facing our country on a single section of society, whether immigrants, Muslims or another group.

This trend stretches beyond our borders. From Ukip, the French Front National and Austria’s Freedom Party to Podemos in Spain and Italy’s Five Star Movement, new populist parties of the right and left are on the rise across Europe. In the United States, Bernie Sanders is tapping into the energy of Occupy Wall Street, while Donald Trump has emerged as the heir to the Tea Party: a poster boy for division and recrimination.

Trump’s rise should be a warning for us Brits. The New York Times commentator David Brooks has described his success as less indicative of the emergence of a new school of thought, or movement, and more of dissatisfaction with the status quo. Trump’s campaign has tapped into a complex cocktail of grievances, from the loss of manufacturing jobs in a globalised economy to rising inequality and raw anger felt by many white working-class Americans at demographic and cultural changes.

In the run-up to last year’s general election, as I travelled around the country, I was confronted time and time again with the reality that in the UK – just like in the US – people are afraid and angry because the world is changing in ways they fear are beyond their control. Where once they had believed that, if they worked hard, they would get ahead, too many Britons now feel that the system is rigged in favour of those born into opportunity and that those in power have abandoned them to a broken future. What it means to be British seems to have shifted around them, triggering a crisis of solidarity.

We are at a crossroads and may face nothing less than the Trumpification of British politics. In an uncertain and changing world, it is all too easy to imagine that our problems are caused by those who are different from us.

If we wish to follow the fine example set by Londoners on 5 May and choose unity and empathy over division and blame, we must accept that simply “tolerating” one another will no longer do. There is an accusation built into the very word: what you are doing is “other” or “wrong”. As Britain has become more diverse, we have come to know each other less. This makes it harder to understand how people from different walks of life feel about the big issues.

I am a Labour member because I believe, as it says on our membership cards, that, by the strength of our common endeavour, we achieve more together than we do alone. In order to develop the bonds of trust required for this to become a reality, and for our communities to flourish and our democracy to deliver for everyone, we must build a society in which people from all backgrounds actually get to know one another and lead interconnected lives. In this sense, “One Nation” – the land over which all parties seek purchase – should become more than a platitude. It should become a way of life.

Chuka Umunna is Labour MP for Streatham.

This article first appeared in the 26 May 2016 issue of the New Statesman, The Brexit odd squad