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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Labour's establishment suspects a Momentum conspiracy - they're right

Bernie Sanders-style organisers are determined to rewire the party's machine.  

If you wanted to understand the basic dynamics of this year’s Labour leadership contest, Brighton and Hove District Labour Party is a good microcosm. On Saturday 9 July, a day before Angela Eagle was to announce her leadership bid, hundreds of members flooded into its AGM. Despite the room having a capacity of over 250, the meeting had to be held in three batches, with members forming an orderly queue. The result of the massive turnout was clear in political terms – pro-Corbyn candidates won every position on the local executive committee. 

Many in the room hailed the turnout and the result. But others claimed that some in the crowd had engaged in abuse and harassment.The national party decided that, rather than first investigate individuals, it would suspend Brighton and Hove. Add this to the national ban on local meetings and events during the leadership election, and it is easy to see why Labour seems to have an uneasy relationship with mass politics. To put it a less neutral way, the party machine is in a state of open warfare against Corbyn and his supporters.

Brighton and Hove illustrates how local activists have continued to organise – in an even more innovative and effective way than before. On Thursday 21 July, the week following the CLP’s suspension, the local Momentum group organised a mass meeting. More than 200 people showed up, with the mood defiant and pumped up.  Rather than listen to speeches, the room then became a road test for a new "campaign meetup", a more modestly titled version of the "barnstorms" used by the Bernie Sanders campaign. Activists broke up into small groups to discuss the strategy of the campaign and then even smaller groups to organise action on a very local level. By the end of the night, 20 phonebanking sessions had been planned at a branch level over the following week. 

In the past, organising inside the Labour Party was seen as a slightly cloak and dagger affair. When the Labour Party bureaucracy expelled leftwing activists in past decades, many on went further underground, organising in semi-secrecy. Now, Momentum is doing the exact opposite. 

The emphasis of the Corbyn campaign is on making its strategy, volunteer hubs and events listings as open and accessible as possible. Interactive maps will allow local activists to advertise hundreds of events, and then contact people in their area. When they gather to phonebank in they will be using a custom-built web app which will enable tens of thousands of callers to ring hundreds of thousands of numbers, from wherever they are.

As Momentum has learned to its cost, there is a trade-off between a campaign’s openness and its ability to stage manage events. But in the new politics of the Labour party, in which both the numbers of interested people and the capacity to connect with them directly are increasing exponentially, there is simply no contest. In order to win the next general election, Labour will have to master these tactics on a much bigger scale. The leadership election is the road test. 

Even many moderates seem to accept that the days of simply triangulating towards the centre and getting cozy with the Murdoch press are over. Labour needs to reach people and communities directly with an ambitious digital strategy and an army of self-organising activists. It is this kind of mass politics that delivered a "no" vote in Greece’s referendum on the terms of the Eurozone bailout last summer – defying pretty much the whole of the media, business and political establishment. 

The problem for Corbyn's challenger, Owen Smith, is that many of his backers have an open problem with this type of mass politics. Rather than investigate allegations of abuse, they have supported the suspension of CLPs. Rather than seeing the heightened emotions that come with mass mobilisations as side-effects which needs to be controlled, they have sought to joins unconnected acts of harassment, in order to smear Jeremy Corbyn. The MP Ben Bradshaw has even seemed to accuse Momentum of organising a conspiracy to physically attack Labour MPs.

The real conspiracy is much bigger than that. Hundreds of thousands of people are arriving, enthusiastic and determined, into the Labour party. These people, and their ability to convince the communities of which they are a part, threaten Britain’s political equilibrium, both the Conservatives and the Labour establishment. When the greatest hope for Labour becomes your greatest nightmare, you have good call to feel alarmed.