George Osborne stands behind the bar during a visit to officially re-open The Red Lion pub following a major refurbishment in Westminster on February 25, 2014. Photograph: Getty Images
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How big is Osborne's black hole? The problem is we don't know

The level of austerity required varies hugely depending on how much growth is thought possible.

Today's FT story on George Osborne's "£20bn black hole" might appear puzzling at first. With the British economy growing faster than that of any other major western country (albeit after three years of stagnation), shouldn't the public finances be getting better, not worse? On one level they are: borrowing for 2013-14  is currently £4bn lower than last year. But the problem for the Chancellor is that the models used by the Office for Budget Responsibility (the budgetary watchdog he founded in 2010), which the FT has replicated, deem this improvement to be almost entirely cyclical (temporary), rather than structural (permanent). While the body's short-term forecasts have improved, its long-term forecasts have worsened. Osborne's cuts have permanently dented the economy's growth potential. The result is that the structural deficit (the part of the deficit that exists regardless of the level of growth) is now estimated to be even bigger than first thought, and that means even more austerity will be needed to balance the books. 

The problem with all of these forecasts is that they hinge on one highly uncertain judgement: the size of the output gap. The output gap (or the level of "spare capacity") is the difference between current and potential growth. If the gap is thought to be large, then a significant chunk of the deficit can be eliminated over time through growth, rather than spending cuts and tax rises. But if it is thought to be small (the OBR puts it at 1.8 per cent), then even greater austerity is needed. At present, the OBR estimates that the structural deficit will be £85bn this year, while the total deficit will be £111bn (meaning £26bn of austerity is avoided). But the FT''s updated forecasts suggest that the difference between the two might be smaller than thought, hence the warning of a "£20bn black hole". 

The complication for Osborne (and Ed Balls, who has pledged to eliminate the current deficit by the end of the next parliament) is that economists are hugely divided over the potential for higher growth (the Independent's Ben Chu has a useful graph of their differing forecasts here). The Bank of England's Monetary Policy Committee is even more pessimistic than the OBR; it estimates that the output gap is just 1-1.5 per cent, meaning that austerity of £91-97bn will be needed to Osborne to meet his target of running a budget surplus by 2018-19. But the market, on average, is more optimistic than both; it assumes an output gap of 2.7 per cent, meaning the level of austerity required falls to £77bn. Others are even more optimistic. The National Institute for Economic and Social Research (NIESR) puts the output gap at 4.3 per cent, with £60bn of austerity required, at least £30bn less than assumed by the Bank of England. 

The danger highlighted by some economists is that an overly pessimistic estimate could lead to austerity being applied more severely than necessary. As Andrew Goodwin, senior economist at Oxford Economics, has said: "Oxford Economics analysis suggests that the economy has a significantly larger amount of spare capacity than the OBR estimates which, in turn, suggests that the medicine of austerity could end up being applied in a dose higher than the patient actually needs."  This calculation matters as much for Labour as it does for the Tories. The level of growth thought possible will determine the amount the party can spend on its priorities - housing, childcare, employment, skills, health and social care - while meeting its tough deficit reduction targets. If it follows Osborne and uses the OBR's pessimistic forecasts, it could end up with a minimalist manifesto it later regrets. 

Wonkish it might be, but the output gap is probably the most important number in British politics. 

George Eaton is political editor of the New Statesman.

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Donald Trump's healthcare failure could be to his advantage

The appearance of weakness is less electorally damaging than actually removing healthcare from millions of people.

Good morning. Is it all over for Donald Trump? His approval ratings have cratered to below 40%. Now his attempt to dismantle Barack Obama's healthcare reforms have hit serious resistance from within the Republican Party, adding to the failures and retreats of his early days in office.

The problem for the GOP is that their opposition to Obamacare had more to do with the word "Obama" than the word "care". The previous President opted for a right-wing solution to the problem of the uninsured in a doomed attempt to secure bipartisan support for his healthcare reform. The politician with the biggest impact on the structures of the Affordable Care Act is Mitt Romney.

But now that the Republicans control all three branches of government they are left in a situation where they have no alternative to Obamacare that wouldn't either a) shred conservative orthodoxies on healthcare or b) create numerous and angry losers in their constituencies. The difficulties for Trump's proposal is that it does a bit of both.

Now the man who ran on his ability to cut a deal has been forced to make a take it or leave plea to Republicans in the House of Representatives: vote for this plan or say goodbye to any chance of repealing Obamacare.

But that's probably good news for Trump. The appearance of weakness and failure is less electorally damaging than actually succeeding in removing healthcare from millions of people, including people who voted for Trump.

Trump won his first term because his own negatives as a candidate weren't quite enough to drag him down on a night when he underperformed Republican candidates across the country. The historical trends all make it hard for a first-term incumbent to lose. So far, Trump's administration is largely being frustrated by the Republican establishment though he is succeeding in leveraging the Presidency for the benefit of his business empire.

But it may be that in the failure to get anything done he succeeds in once again riding Republican coattails to victory in 2020.

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