What does a latte tell us about currencies? Very little, actually

Purchasing power parity is not the same as the Big Mac Index.

The Wall Street Journal sees what the Economist is having, and it likes it. The latter's Big Mac Index is famous for demonstrating the variation in prices for the same good around the world. Despite Big Macs being basically identical no matter where you are, the dollar price varies wildly, from $6.81 in Switzerland down to just $1.82 in India. It's so influential that it's widely thought that Argentina is exerting pressure on its branches of McDonalds to keep the price down so as to not provide evidence of the nation's tinkering with reported inflation.

So now the WSJ wants a piece of the action, and has created its Starbucks Latte Index. I mean, it doesn't call it that, but that's what they're thinking:

Click to embiggen.

But like the Economist, the WSJ draws the wrong inferences from the variation. They both have a habit of using the data to illustrate purchasing power parity, the idea that some currencies are under- or over-valued because a comparable basket of goods varies in price. So the WSJ's Ira Iosebashvili writes:

One way to determine how currencies stack up is purchasing-power parity, or PPP, which compares the amount of currency needed to buy the same item in different countries. A grande latte at Starbucks, for example, costs $4.30 in New York, but the equivalent of $9.83 using Norwegian krone in Oslo, and just $3.92 in Turkish lira in Istanbul.

Starbucks Lattes and Big Macs both have another unique feature, though, which renders them less useful for comparing the strength of a currency overall: they are both made up of highly fungible goods, produced in two of the most integrated supply chains in the world. McDonalds, for instance, doesn't need to buy artisanal wheat from an individual farm; it can just trade in "wheat" as a mass-produced, internationally-traded com oddity. The company has even invented a product to sell to take advantage of variations in the cost of pork, the McRib.

In fact, for Starbucks, that's even more true than it is for MacDonalds. While Maccy D's has made a big deal out of its promise to only use British beef in its British burgers, most of the countries Starbucks operates in in don't grow their own coffee. That has to be imported from South America or North Africa, and so a Starbucks in London will almost certainly be paying the same for its coffee as a branch in Oslo, despite the difference in retail price being over $6.

What the Starbucks and Big Mac indices actually show is the price of unskilled labour and retail space. Those are the parts of the companies' businesses which, no matter how hard they try, they can't erase national differences from. Operating in Oslo, land of high taxes, is always going to be expensive, no matter how strong or weak the krone is.

The Starbucks index even makes this clear, thanks to the fact that the WSJ has included three American cities. A latte in New York City costs more than one in Detroit, a difference that self-evidently can't be due to the currency variation.

But the really important news is that London is actually one of the cheapest cities in the world for a Starbucks latte. Still overpriced for what it is, though.

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

Photo: Getty
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Unite stewards urge members to back Owen Smith

In a letter to Unite members, the officials have called for a vote for the longshot candidate.

29 Unite officials have broken ranks and thrown their weight behind Owen Smith’s longshot bid for the Labour leadership in an open letter to their members.

The officials serve as stewards, conveners and negotiators in Britain’s aerospace and shipbuilding industries, and are believed in part to be driven by Jeremy Corbyn’s longstanding opposition to the nuclear deterrent and defence spending more generally.

In the letter to Unite members, who are believed to have been signed up in large numbers to vote in the Labour leadership race, the stewards highlight Smith’s support for extra funding in the NHS and his vision for an industrial strategy.

Corbyn was endorsed by Unite, Labour's largest affliated union and the largest trades union in the country, following votes by Unite's ruling executive committee and policy conference. 

Although few expect the intervention to have a decisive role in the Labour leadership, regarded as a formality for Corbyn, the opposition of Unite workers in these industries may prove significant in Len McCluskey’s bid to be re-elected as general secretary of Unite.

 

The full letter is below:

Britain needs a Labour Government to defend jobs, industry and skills and to promote strong trade unions. As convenors and shop stewards in the manufacturing, defence, aerospace and energy sectors we believe that Owen Smith is the best candidate to lead the Labour Party in opposition and in government.

Owen has made clear his support for the industries we work in. He has spelt out his vision for an industrial strategy which supports great British businesses: investing in infrastructure, research and development, skills and training. He has set out ways to back British industry with new procurement rules to protect jobs and contracts from being outsourced to the lowest bidder. He has demanded a seat at the table during the Brexit negotiations to defend trade union and workers’ rights. Defending manufacturing jobs threatened by Brexit must be at the forefront of the negotiations. He has called for the final deal to be put to the British people via a second referendum or at a general election.

But Owen has also talked about the issues which affect our families and our communities. Investing £60 billion extra over 5 years in the NHS funded through new taxes on the wealthiest. Building 300,000 new homes a year over 5 years, half of which should be social housing. Investing in Sure Start schemes by scrapping the charitable status of private schools. That’s why we are backing Owen.

The Labour Party is at a crossroads. We cannot ignore reality – we need to be radical but we also need to be credible – capable of winning the support of the British people. We need an effective Opposition and we need a Labour Government to put policies into practice that will defend our members’ and their families’ interests. That’s why we are backing Owen.

Steve Hibbert, Convenor Rolls Royce, Derby
Howard Turner, Senior Steward, Walter Frank & Sons Limited
Danny Coleman, Branch Secretary, GE Aviation, Wales
Karl Daly, Deputy Convenor, Rolls Royce, Derby
Nigel Stott, Convenor, BASSA, British Airways
John Brough, Works Convenor, Rolls Royce, Barnoldswick
John Bennett, Site Convenor, Babcock Marine, Devonport, Plymouth
Kevin Langford, Mechanical Convenor, Babcock, Devonport, Plymouth
John McAllister, Convenor, Vector Aerospace Helicopter Services
Garry Andrews, Works Convenor, Rolls Royce, Sunderland
Steve Froggatt, Deputy Convenor, Rolls Royce, Derby
Jim McGivern, Convenor, Rolls Royce, Derby
Alan Bird, Chairman & Senior Rep, Rolls Royce, Derby
Raymond Duguid, Convenor, Babcock, Rosyth
Steve Duke, Senior Staff Rep, Rolls Royce, Barnoldswick
Paul Welsh, Works Convenor, Brush Electrical Machines, Loughborough
Bob Holmes, Manual Convenor, BAE Systems, Warton, Lancs
Simon Hemmings, Staff Convenor, Rolls Royce, Derby
Mick Forbes, Works Convenor, GKN, Birmingham
Ian Bestwick, Chief Negotiator, Rolls Royce Submarines, Derby
Mark Barron, Senior Staff Rep, Pallion, Sunderland
Ian Hodgkison, Chief Negotiator, PCO, Rolls Royce
Joe O’Gorman, Convenor, BAE Systems, Maritime Services, Portsmouth
Azza Samms, Manual Workers Convenor, BAE Systems Submarines, Barrow
Dave Thompson, Staff Convenor, BAE Systems Submarines, Barrow
Tim Griffiths, Convenor, BAE Systems Submarines, Barrow
Paul Blake, Convenor, Princess Yachts, Plymouth
Steve Jones, Convenor, Rolls Royce, Bristol
Colin Gosling, Senior Rep, Siemens Traffic Solutions, Poole

Stephen Bush is special correspondent at the New Statesman. He usually writes about politics.