ONS decides to continue with inaccurate RPI calculation

Statistics agency chooses consistency over accuracy.

Against expectations and the recommendations of a number of influential economists, as well as its own consumer prices advisory committee, the ONS has decided not to change how the RPI – one of the two key indices measuring the rate of price inflation – is calculated.

The pressure to examine the index comes from the longstanding difference between the RPI and CPI measures of inflation. Except for the brief period in the midst of the recession, when both indices were recording deflation, RPI has consistently shown levels of inflation higher than CPI. Here's the chart for the last three years, for instance:

 

Some of that difference is due to the fact that the two indices measure subtly different things – RPI includes a broader measure of housing costs, for instance, and it ignores very high and low income households. But the ONS has known for a while that there is also a discrepancy caused by the different formulae used to calculate them.

The ONS began a consultation into whether and how it should eliminate this "formula effect", and has concluded that:

Use of the arithmetic formulation (known as the ‘Carli’ index formula) in the RPI is the primary source of the formula effect difference between the RPI and the CPI… This formulation does not meet current international standards.

So what's it going to do about it? Well, nothing:

The National Statistician also noted that there is significant value to users in maintaining the continuity of the existing RPI’s long time series without major change, so that it may continue to be used for long-term indexation and for index-linked gilts and bonds in accordance with user expectations.

Therefore, while the arithmetic formulation would not be chosen were ONS constructing a new price index, the National Statistician recommended that the formulae used at the elementary aggregate level in the RPI should remain unchanged.

The ONS will, however, develop a new measure of inflation, called RPIJ, which will use a different, better, mathematical formula.

The consumer prices advisory committee, a body which meets around five times a year to advise the ONS on measures of inflation, accepted that the ONS has a responsibility to make sure that there is a level of continuity in the RPI calculations which would be destroyed if there were a change to the formula. But, given the ONS also has a responsibility to compile those statistics "in line with best practice", CPAC concluded that not changing RPI would be "unsuitable".

On the other side, arguing for no change, were 332 of the 406 replies to the public consultation. The ONS said:

The large majority of responses did not address methodological issues but identified the impact that the changes implied… would have for them.

The competing requirements present a tricky path for the ONS to follow, but it does feel like it has picked the wrong option at this point. The job of the statistics agency is surely to produce accurate statistics, rather than statistics which are continually inaccurate in known ways. The fact that RPI is used to decide the value of, amongst other things, index-linked bonds is a reason for it to be correct, not for it to be artificially inflated.

As it stands, the ONS has decided to continue publishing a "measure" of inflation which has an accepted and understood upward bias of 1 per cent a year. It has done this, not because of any real statistical reasoning, but because greater accuracy would be bad for a majority of stakeholders. That seems like a bizarre abdication of its duty.

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.

Getty
Show Hide image

Our union backed Brexit, but that doesn't mean scrapping freedom of movement

We can only improve the lives of our members, like those planning stike action at McDonalds, through solidarity.

The campaign to defend and extend free movement – highlighted by the launch of the Labour Campaign for Free Movement this month – is being seen in some circles as a back door strategy to re-run the EU referendum. If that was truly the case, then I don't think Unions like mine (the BFAWU) would be involved, especially as we campaigned to leave the EU ourselves.

In stark contrast to the rhetoric used by many sections of the Leave campaign, our argument wasn’t driven by fear and paranoia about migrant workers. A good number of the BFAWU’s membership is made up of workers not just from the EU, but from all corners of the world. They make a positive contribution to the industry that we represent. These people make a far larger and important contribution to our society and our communities than the wealthy Brexiteers, who sought to do nothing other than de-humanise them, cheered along by a rabid, right-wing press. 

Those who are calling for end to freedom of movement fail to realise that it’s people, rather than land and borders that makes the world we live in. Division works only in the interest of those that want to hold power, control, influence and wealth. Unfortunately, despite a rich history in terms of where division leads us, a good chunk of the UK population still falls for it. We believe that those who live and work here or in other countries should have their skills recognised and enjoy the same rights as those born in that country, including the democratic right to vote. 

Workers born outside of the UK contribute more than £328 million to the UK economy every day. Our NHS depends on their labour in order to keep it running; the leisure and hospitality industries depend on them in order to function; the food industry (including farming to a degree) is often propped up by their work.

The real architects of our misery and hardship reside in Westminster. It is they who introduced legislation designed to allow bosses to act with impunity and pay poverty wages. The only way we can really improve our lives is not as some would have you believe, by blaming other poor workers from other countries, it is through standing together in solidarity. By organising and combining that we become stronger as our fabulous members are showing through their decision to ballot for strike action in McDonalds.

Our members in McDonalds are both born in the UK and outside the UK, and where the bosses have separated groups of workers by pitting certain nationalities against each other, the workers organised have stood together and fought to win change for all, even organising themed social events to welcome each other in the face of the bosses ‘attempts to create divisions in the workplace.

Our union has held the long term view that we should have a planned economy with an ability to own and control the means of production. Our members saw the EU as a gravy train, working in the interests of wealthy elites and industrial scale tax avoidance. They felt that leaving the EU would give the UK the best opportunity to renationalise our key industries and begin a programme of manufacturing on a scale that would allow us to be self-sufficient and independent while enjoying solid trading relationships with other countries. Obviously, a key component in terms of facilitating this is continued freedom of movement.

Many of our members come from communities that voted to leave the EU. They are a reflection of real life that the movers and shakers in both the Leave and Remain campaigns took for granted. We weren’t surprised by the outcome of the EU referendum; after decades of politicians heaping blame on the EU for everything from the shape of fruit to personal hardship, what else could we possibly expect? However, we cannot allow migrant labour to remain as a political football to give succour to the prejudices of the uninformed. Given the same rights and freedoms as UK citizens, foreign workers have the ability to ensure that the UK actually makes a success of Brexit, one that benefits the many, rather than the few.

Ian Hodon is President of the Bakers and Allied Food Workers Union and founding signatory of the Labour Campaign for Free Movement.