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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The UK is dangerously close to breaking apart - there's one way to fix it

We must rethink our whole constitutional settlement. 

When the then-Labour leader John Smith set up a report on social justice for what would be the incoming government in 1997, he said we must stop wasting our most precious resource – "the extraordinary skills and talents of ordinary people".

It is one of our party’s greatest tragedies that he never had the chance to see that vision put into practice. 

At the time, it was clear that while our values of equality, solidarity and tolerance endured, the solutions we needed were not the same as those when Labour was last in power in the 1970s, and neither were they to be found in the policies of opposition from the 1980s. 

The Commission on Social Justice described a UK transformed by three revolutions:

  • an economic revolution brought about by increasing globalisation, innovation and a changing labour market
  • a social revolution that had seen the role of women in society transformed, the traditional family model change, inequality ingrained and relationships between people in our communities strained
  • a political revolution that challenged the centralisation of power, demanded more individual control and accepted a different role for government in society.

Two decades on, these three revolutions could equally be applied to the UK, and Scotland, today. 

Our economy, society and our politics have been transformed even further, but there is absolutely no consensus – no agreement – about the direction our country should take. 

What that has led to, in my view, is a society more dangerously divided than at any point in our recent history. 

The public reject the status quo but there is no settled will about the direction we should take. 

And instead of grappling with the complex messages that people are sending us, and trying to find the solutions in the shades of grey, politicians of all parties are attached to solutions that are black or white, dividing us further. 

Anyone in Labour, or any party, who claims that we can sit on the margins and wait for politics to “settle down” will rightly be consigned to history. 

The future shape of the UK, how we govern ourselves and how our economy and society should develop, is now the single biggest political question we face. 

Politics driven by nationalism and identity, which were for so long mostly confined to Scotland, have now taken their place firmly in the mainstream of all UK politics. 

Continuing to pull our country in these directions risks breaking the United Kingdom once and for all. 

I believe we need to reaffirm our belief in the UK for the 21st century. 

Over time, political power has become concentrated in too few hands. Power and wealth hoarded in one corner of our United Kingdom has not worked for the vast majority of people. 

That is why the time has come for the rest of the UK to follow where Scotland led in the 1980s and 1990s and establish a People’s Constitutional Convention to re-establish the UK for a new age. 

The convention should bring together groups to deliberate on the future of our country and propose a way forward that strengthens the UK and establishes a new political settlement for the whole of our country. 

After more than 300 years, it is time for a new Act of Union to safeguard our family of nations for generations to come.

This would mean a radical reshaping of our country along federal lines where every component part of the United Kingdom – Scotland, Wales, Northern Ireland and the English regions – take more responsibility for what happens in their own communities, but where we still maintain the protection of being part of a greater whole as the UK. 

The United Kingdom provides the redistribution of wealth that defines our entire Labour movement, and it provides the protection for public finance in Scotland that comes from being part of something larger, something good, and something worth fighting for. 

Kezia Dugdale is the leader of the Scottish Labour party.