The OBR has been a victim of its own success

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FT editor Raula Khalaf selected his favorite stories in this weekly newsletter.

Author is the author of ‘Growth: A Reconging’ and an economist at the University of Oxford and King’s College London

In general, the Chancellor’s spring statement will be an important moment in the UK Public Finance forecasts from the office for the expected budget responsibility this month. Now, this is an earthquake. An organization established to reduce the prejudice in the forecast of public finance has now found itself with a far -reaching role: plan to achieve the central mission of the government – the plan to achieve more economic growth is the right.

This is never meant to be OBR’s purpose. Set -up by Chancellor George Osburn in 20, it was designed to solve a different problem: that the UK official finance forecast was not credible. Whatever the political make-up of the government, there was a strong incentive for the treasury to massage these numbers. And believed that an independent statistics authority would be free from that temptation. In this extent, OBR is a success story: its forecasts seem less biased.

However, forecasts for the UK’s public finance also require forecasts about the UK economy – among them, which is expected to grow. If the economy is delighted with joy, these numbers will only play a supporting role. However, the economy has stagnant, the government has changed its main priority and its glory treasury does not make its own official growth forecast. So the numbers of OBR have been emphasized on the spotlight.

Although the complexity here: OBR doesn’t really know what the reason for the growth. In fact, no one does. The real reasons for growth are one of the great mysteries of economic thinking. Hundreds of potential reasons have been identified: from tax cut to infrastructure expenditure, the number of frost days up to the newspaper readers level. And today they are deeply competing in various thought schools, deeply divided into political lines and conflicts with each other.

Keeping this in mind, OBR knows this idea enough to adopt the official policy of each UK Describe its impact on growth Fictitious at a single decimal point. Nevertheless, it will try to have a lot of practical consequences at the end of the month. For example, 0.1 percent points in forecasts of OBR’s potential productivity are estimated to create a hole of £ 7bn-£ 8bn in public finance- this is equivalent to the full budget of DFRA.

But in other countries do not have an independent “financial surveillance” like OBR? Yes, many do, but their role is different. The most simply evaluate the forecast of the Government of Government or provide the option of sitting as well. OBR actually produces it. And Chancellor Rachel Reeves has gone ahead, clearly OBR numbers are baking in its new financial rules, specifying their forecasts.

So we find ourselves in a strange world where Reeves has been advised not to do the growth of his faith, but to see what OBR has taken up the growth growth. Then he must do as much as possible with his financial obstacles, so the forecasts are better. In the Old World, the HMT numbers were encouraged to shake; In the new, the HMT policy has been encouraged to shake.

What’s more, if the OBR decides to challenge the forecasts in the public during the release of the Reeves – he probably said that their internal model did not capture the promise of its growth strategy correctly – which does not look like a valid intellectual disagreement about the true reasons for growth. It would be a risk to be seen as a shameful attempt to dodge the rules set up to end financial availability.

OBR was established with a good purpose. However, it has been the victim of his own success. One of the most contested economic questions is a difficult political judgment – which is actually the cause of growth – it has decreased in a technical calculation originally edited by the public.

What should we do? In the beginning, the uncertainty of forecasting OBR’s growth must be more clearly recognized: freedom can reduce their bias, but it does not make them correct. Politicians must be brave enough to say it; OBR must be moderate enough to agree.

Instead, the treasury must consider re -introducing its own growth forecasts. This is probably not because they are more accurate than OBR, but we need more public debates and disagreements in policy making, no less than we can find creative ways from our current economic catastrophe.

Finally, Reeves should revisit its financial rules, maintaining their basic consciousness – the current budget of the balance, the debt reads as part of the economy – when the substance tweeted so they do not draw so much color sets in calculation sets that may be probably wrong as all the forecasts.