The most important paragraph in the IMF World Economic Outlook

68 words of wonkishness.

The IMF's World Economic Outlook (pdf) – a 230-page tome detailing predictions on nearly every aspect of the world's economy collated by the international organisation – always gets attention for the calls it makes.

The October edition downgrades expected global growth for 2013 from 3.9 per cent to 3.6 per cent, and also cuts predictions for China (down to 8.2 per cent for 2013), the US (expected to grow by 2.1 per cent in 2013, down from 2.3 per cent in July's prediction) and the UK (now expected to grow by just 1.1 per cent next year, and to contract by 0.2 per cent this year).

But the predictions are not the most important passages in this edition of the Outlook. Those are found in a short box-out titled Are We Underestimating Short-Term Fiscal Multipliers?

The fisc§al multiplier is the effect government spending has on GDP. Money spent by the government doesn't disappear – it is respent, again and again. If a teacher gets a pay rise, their consumption is likely to rise in line with it; if all teachers get pay rises, that increase in consumption may be enough to affect the aggregate demand in the economy. In an economy which isn't being stretched to its limits – that is, one without full employment, or serious capital equipment shortages – that increase in aggregate demand will result in an increase in GDP.

The existence of the fiscal multiplier is a matter of fact, but the magnitude of it is contested. And that's where the IMF enters the scene, on page 42:

The main finding, based on data for 28 economies, is that the multipliers used in generating growth forecasts have been systematically too low since the start of the Great Recession, by 0.4 to 1.2, depending on the forecast source and the specifics of the estimation approach. Informal evidence suggests that the multipliers implicitly used to generate these forecasts are about 0.5. So actual multipliers may be higher, in the range of 0.9 to 1.7.

Emphasis mine. When deciding how much to spend, governments have been assuming that every pound they spend increases GDP by 50p – but it may increase it by as much as £1.70.

The reason this is so very important is that fiscal multiplier is usually appealed to not when deciding how much to spend, but how much to not spend. When governments are planning austerity packages, they have to be wary of the fact that large cuts to government spending will inevitably cause a decrease in output, and so they either have to be prepared to take that hit, or come up with a reason why slashing spending will cause an increase in output through some other mechanism.

That is easy enough to do if you are trying to account for a fiscal multiplier of 0.5: you can make the arguments, which Osborne and Cameron rehearsed repeatedly, that the public sector is crowding out the private; that the government spending which is being cut is particularly inefficient; or that the confidence fairies will reward your thriftiness with growth.

When there is the chance that the fiscal multiplier is three times that, austerity becomes much more likely to involve damaging drops in output.

There was once a time when the government pegged its credibility to that of the IMF – back when George Osborne was proud about Britain's credit ratings, and the international community was behind his plans. Those days are gone, and have been since Christine Lagarde made her own attack on austerity. But the economists at the treasury may be more inclined to listen to the wonkish findings of the World Outlook than the political interventions of the fund's leader. We can only hope they are prompted to re-do the sums.

The IMF headquarters. 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 polls are bad, but Jeremy Corbyn’s office has a secret weapon

How a shake-up of the leadership team has steadied nerves at the top of Labour. 

If polling had existed back in 1906, Jeremy Corbyn quipped at one recent strategy meeting, the Labour Party would never have got started.

As far as Labour’s direction is concerned, it is that meeting at four o’clock every Monday afternoon that matters. The people who attend it regularly are the Labour leader, his aides, the shadow home secretary, Diane Abbott, and the shadow chancellor, John McDonnell, as well as the party’s election co-ordinator, and their respective aides.

In recent weeks, the meetings have been stormy affairs, and not only because the numbers from the party’s own pollsters, BMG Research, mirror the uniformly bleak picture from the public polls. There is also concern over Karie Murphy, Corbyn’s office manager. Murphy is highly rated by Corbyn for having brought increased intensity and efficiency to the leader’s office. Corbyn often struggles to deliver bad news in person and appreciates that Murphy will intervene on his behalf.

Her intensity is not uniformly welcomed. “She could start a fight with her own reflection,” in the wry words of one friend. An argument with Jon Trickett – the Hemsworth MP whose unusual career trajectory took him from being a parliamentary aide to Peter Mandelson to the inner sanctum of Ed Miliband’s leadership and finally to the role of election co-ordinator for Corbyn – led to Trickett going on a two-week strike, recusing himself from vital meetings and avoiding any contact with Murphy.

That row eventually led to Trickett being stripped of his role and banished from the Monday meeting. Murphy had a similar turf war with the campaigns director, Simon Fletcher, which culminated in Fletcher resigning on 17 February. In a letter to staffers, he called on the party to “keep the promise” of Corbyn’s first leadership bid, a period when Fletcher was central and Murphy had yet to start working for the Labour leader.

All of which, in better political weather, would simply be part of the back-and-forth of office politics. However, set against the backdrop of unease about by-elections in Stoke-on-Trent Central and Copeland, and a series of unhelpful leaks, it adds to a sense of vulnerability around the leadership. One loyalist shadow cabinet minister calls it “the most dangerous time” for Corbyn since he was first elected leader.

Why the danger? Contrary to popular myth, the backbone of Jeremy Corbyn’s successive landslide victories was not a hard-pressed twentysomething, struggling to find a fixed job or to get a foot on the housing ladder. The shock troops of Corbynism, at least as far as the internal battle in the Labour Party went, were baby boomers. Many of them were either working in, or on early retirement from, a charity or the public sector, deeply concerned about the rightward drift of British politics and worried about the next generation.

Corbyn’s decision to whip Labour MPs in support of triggering Article 50 – the process whereby Britain will begin its exit from the European Union – was, in their eyes, a double heresy. The vote signalled acceptance that the forces of the Eurosceptic right had won on 23 June, and it conceded that visa-free travel, membership of the single market and freedom of movement are over.

None of this is automatically great news for Corbyn’s internal critics – not least because the vote on Article 50 is rare in being an issue that unites Corbyn with most Labour MPs. Yet it adds to the sense that his leadership has passed its best-before date.

Adding to the general malaise is a series of unhelpful leaks. There was a story in the Sunday Times on 12 February claiming that the leadership was road-testing possible replacements for Corbyn, and on 20 February the Mirror claimed that the Labour leadership had commissioned a poll to find out whether or not the leader should quit his post. These stories are hotly denied by the leader’s office. Some in Corbyn’s inner circle believe they are the work of Trickett, embittered at his demotion.

It is true that Corbyn is not enjoying the job as much as he once did. However, if the conversation shifts from the minutiae of Brexit to his natural terrain of the NHS and the continuing consequences of government cuts on education and the prisons service, he could quickly find himself relishing the role once more.

Corbyn retains two powerful cards. His newly energised office, under Karie Murphy, is one. Although her brisk approach has generated some public rows, the feeling in the leader’s office is that a chief of staff was needed, and Murphy has assumed that role. The media team has also grown sharper with the addition of David Prescott (son of John), Matt Zarb-Cousin and the former Momentum spokesman James Schneider.

Corbyn’s second asset is more unexpected. His rivals inside the party now fear rather than relish an immediate end to his leadership. A former shadow cabinet member splits his supporters into two groups: “idealists and ideologues – the first we can inspire and win over, the second have to be got rid of”. In their view, the idealists have not yet moved away from Corbyn enough to guarantee victory; the ideologues, for their part, will slink off as Corbyn puts the demands of his office above their interests, as he did over Article 50.

Although self-defeating panic has never been a rare commodity in the Labour Party, the settled view of Labour MPs is that their leader must be given time and space rather than hustled out of the door. There is an awareness, too, that MPs who are united in opposition to Corbyn are divided over many other issues.

So, while the inner circle’s Monday meetings might be fraught, and Labour’s current polling would have given Keir Hardie pause, Jeremy Corbyn is safe. 

Stephen Bush is special correspondent at the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to British politics.

This article first appeared in the 24 February 2017 issue of the New Statesman, The world after Brexit