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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All the Premiership teams are competing to see who’s got the biggest stadium

It’s not just a financial, but a macho thing – the big clubs want to show off that they have a whopper.

Here in NW5, where we live noisily and fashionably, we are roughly equidistant from Arsenal and Spurs. We bought the house in 1963 for £5,000, which I mention constantly, to make everyone in the street pig sick. Back in 1963, we lived quietly and unfashionably; in fact, we could easily have been living in Loughton, Essex. Now it’s all changed. As have White Hart Lane and Highbury.

Both grounds are a few metres further away from us than they once were, or they will be when White Hart Lane is finished. The new stadium is a few metres to the north, while the Emirates is a few metres to the east.

Why am I saying metres? Like all football fans, I say a near-miss on goal was inches wide, a slow striker is a yard off his pace, and a ball player can turn on a sixpence. That’s more like it.

White Hart Lane, when finished, will hold 61,000 – a thousand more than the Emirates, har har. Meanwhile, Man City is still expanding, and will also hold about 60,000 by the time Pep Guardiola is into his stride. Chelsea will be next, when they get themselves sorted. So will Liverpool.

Man United’s Old Trafford can now hold over 75,000. Fair makes you proud to be alive at this time and enjoying the wonders of the Prem.

Then, of course, we have the New Wembley, architecturally wonderful, striking and stunning, a beacon of beauty for miles around. As they all are, these brave new stadiums. (No one says “stadia” in real life.)

The old stadiums, built between the wars, many of them by the Scottish architect Archibald Leitch (1865-1939), were also seen as wonders of the time, and all of them held far more than their modern counterparts. The record crowd at White Hart Lane was in 1938, when 75,038 came to see Spurs play Sunderland. Arsenal’s record at Highbury was also against Sunderland – in 1935, with 73,295. Wembley, which today can hold 90,000, had an official figure of 126,000 for the first Cup Final in 1923, but the true figure was at least 150,000, because so many broke in.

Back in 1901, when the Cup Final was held at Crystal Palace between Spurs and Sheffield United, there was a crowd of 110,820. Looking at old photos of the Crystal Palace finals, a lot of the ground seems to have been a grassy mound. Hard to believe fans could see.

Between the wars, thanks to Leitch, big clubs did have proper covered stands. Most fans stood on huge open concrete terraces, which remained till the 1990s. There were metal barriers, which were supposed to hold back sudden surges, but rarely did, so if you were caught in a surge, you were swept away or you fell over. Kids were hoisted over the adults’ heads and plonked at the front.

Getting refreshments was almost impossible, unless you caught the eye of a peanut seller who’d lob you a paper bag of Percy Dalton’s. Getting out for a pee was just as hard. You often came home with the back of your trousers soaked.

I used to be an expert on crowds as a lad. Rubbish on identifying a Spitfire from a Hurricane, but shit hot on match gates at Hampden Park and Ibrox. Answer: well over 100,000. Today’s new stadiums will never hold as many, but will cost trillions more. The money is coming from the £8bn that the Prem is getting from TV for three years.

You’d imagine that, with all this money flooding in, the clubs would be kinder to their fans, but no, they’re lashing out, and not just on new stadiums, but players and wages, directors and agents. Hence, so they say, they are having to put up ticket prices, causing protest campaigns at Arsenal and Liverpool. Arsène at Arsenal has admitted that he couldn’t afford to buy while the Emirates was being built. Pochettino is saying much the same at Spurs.

It’s not just a financial, but a macho thing – the big clubs want to show off that they have a whopper. In the end, only rich fans will be able to attend these supergrounds. Chelsea plans to have a private swimming pool under each new box, plus a wine cellar. Just like our street, really . . . 

Hunter Davies is a journalist, broadcaster and profilic author perhaps best known for writing about the Beatles. He is an ardent Tottenham fan and writes a regular column on football for the New Statesman.

This article first appeared in the 11 February 2016 issue of the New Statesman, The legacy of Europe's worst battle