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.

Photo: Getty
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Unite stewards urge members to back Owen Smith

In a letter to Unite members, the officials have called for a vote for the longshot candidate.

29 Unite officials have broken ranks and thrown their weight behind Owen Smith’s longshot bid for the Labour leadership in an open letter to their members.

The officials serve as stewards, conveners and negotiators in Britain’s aerospace and shipbuilding industries, and are believed in part to be driven by Jeremy Corbyn’s longstanding opposition to the nuclear deterrent and defence spending more generally.

In the letter to Unite members, who are believed to have been signed up in large numbers to vote in the Labour leadership race, the stewards highlight Smith’s support for extra funding in the NHS and his vision for an industrial strategy.

Corbyn was endorsed by Unite, Labour's largest affliated union and the largest trades union in the country, following votes by Unite's ruling executive committee and policy conference. 

Although few expect the intervention to have a decisive role in the Labour leadership, regarded as a formality for Corbyn, the opposition of Unite workers in these industries may prove significant in Len McCluskey’s bid to be re-elected as general secretary of Unite.

 

The full letter is below:

Britain needs a Labour Government to defend jobs, industry and skills and to promote strong trade unions. As convenors and shop stewards in the manufacturing, defence, aerospace and energy sectors we believe that Owen Smith is the best candidate to lead the Labour Party in opposition and in government.

Owen has made clear his support for the industries we work in. He has spelt out his vision for an industrial strategy which supports great British businesses: investing in infrastructure, research and development, skills and training. He has set out ways to back British industry with new procurement rules to protect jobs and contracts from being outsourced to the lowest bidder. He has demanded a seat at the table during the Brexit negotiations to defend trade union and workers’ rights. Defending manufacturing jobs threatened by Brexit must be at the forefront of the negotiations. He has called for the final deal to be put to the British people via a second referendum or at a general election.

But Owen has also talked about the issues which affect our families and our communities. Investing £60 billion extra over 5 years in the NHS funded through new taxes on the wealthiest. Building 300,000 new homes a year over 5 years, half of which should be social housing. Investing in Sure Start schemes by scrapping the charitable status of private schools. That’s why we are backing Owen.

The Labour Party is at a crossroads. We cannot ignore reality – we need to be radical but we also need to be credible – capable of winning the support of the British people. We need an effective Opposition and we need a Labour Government to put policies into practice that will defend our members’ and their families’ interests. That’s why we are backing Owen.

Steve Hibbert, Convenor Rolls Royce, Derby
Howard Turner, Senior Steward, Walter Frank & Sons Limited
Danny Coleman, Branch Secretary, GE Aviation, Wales
Karl Daly, Deputy Convenor, Rolls Royce, Derby
Nigel Stott, Convenor, BASSA, British Airways
John Brough, Works Convenor, Rolls Royce, Barnoldswick
John Bennett, Site Convenor, Babcock Marine, Devonport, Plymouth
Kevin Langford, Mechanical Convenor, Babcock, Devonport, Plymouth
John McAllister, Convenor, Vector Aerospace Helicopter Services
Garry Andrews, Works Convenor, Rolls Royce, Sunderland
Steve Froggatt, Deputy Convenor, Rolls Royce, Derby
Jim McGivern, Convenor, Rolls Royce, Derby
Alan Bird, Chairman & Senior Rep, Rolls Royce, Derby
Raymond Duguid, Convenor, Babcock, Rosyth
Steve Duke, Senior Staff Rep, Rolls Royce, Barnoldswick
Paul Welsh, Works Convenor, Brush Electrical Machines, Loughborough
Bob Holmes, Manual Convenor, BAE Systems, Warton, Lancs
Simon Hemmings, Staff Convenor, Rolls Royce, Derby
Mick Forbes, Works Convenor, GKN, Birmingham
Ian Bestwick, Chief Negotiator, Rolls Royce Submarines, Derby
Mark Barron, Senior Staff Rep, Pallion, Sunderland
Ian Hodgkison, Chief Negotiator, PCO, Rolls Royce
Joe O’Gorman, Convenor, BAE Systems, Maritime Services, Portsmouth
Azza Samms, Manual Workers Convenor, BAE Systems Submarines, Barrow
Dave Thompson, Staff Convenor, BAE Systems Submarines, Barrow
Tim Griffiths, Convenor, BAE Systems Submarines, Barrow
Paul Blake, Convenor, Princess Yachts, Plymouth
Steve Jones, Convenor, Rolls Royce, Bristol
Colin Gosling, Senior Rep, Siemens Traffic Solutions, Poole

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