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.

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David Osland: “Corbyn is actually Labour’s only chance”

The veteran Labour activist on the release of his new pamphlet, How to Select or Reselect Your MP, which lays out the current Labour party rules for reselecting an MP.

Veteran left-wing Labour activist David Osland, a member of the national committee of the Labour Representation Committee and a former news editor of left magazine Tribune, has written a pamphlet intended for Labour members, explaining how the process of selecting Labour MPs works.

Published by Spokesman Books next week (advance copies are available at Nottingham’s Five Leaves bookshop), the short guide, entitled “How to Select or Reselect Your MP”, is entertaining and well-written, and its introduction, which goes into reasoning for selecting a new MP and some strategy, as well as its historical appendix, make it interesting reading even for those who are not members of the Labour party. Although I am a constituency Labour party secretary (writing here in an expressly personal capacity), I am still learning the Party’s complex rulebook; I passed this new guide to a local rules-boffin member, who is an avowed Owen Smith supporter, to evaluate whether its description of procedures is accurate. “It’s actually quite a useful pamphlet,” he said, although he had a few minor quibbles.

Osland, who calls himself a “strong, but not uncritical” Corbyn supporter, carefully admonishes readers not to embark on a campaign of mass deselections, but to get involved and active in their local branches, and to think carefully about Labour’s election fortunes; safe seats might be better candidates for a reselection campaign than Labour marginals. After a weak performance by Owen Smith in last night’s Glasgow debate and a call for Jeremy Corbyn to toughen up against opponents by ex Norwich MP Ian Gibson, an old ally, this pamphlet – named after a 1981 work by ex-Tribune editor Chris Mullin, who would later go on to be a junior minister under Blai – seems incredibly timely.

I spoke to Osland on the telephone yesterday.

Why did you decide to put this pamphlet together now?

I think it’s certainly an idea that’s circulating in the Labour left, after the experience with Corbyn as leader, and the reaction of the right. It’s a debate that people have hinted at; people like Rhea Wolfson have said that we need to be having a conversation about it, and I’d like to kickstart that conversation here.

For me personally it’s been a lifelong fascination – I was politically formed in the early Eighties, when mandatory reselection was Bennite orthodoxy and I’ve never personally altered my belief in that. I accept that the situation has changed, so what the Labour left is calling for at the moment, so I see this as a sensible contribution to the debate.

I wonder why selection and reselection are such an important focus? One could ask, isn’t it better to meet with sitting MPs and see if one can persuade them?

I’m not calling for the “deselect this person, deselect that person” rhetoric that you sometimes see on Twitter; you shouldn’t deselect an MP purely because they disagree with Corbyn, in a fair-minded way, but it’s fair to ask what are guys who are found to be be beating their wives or crossing picket lines doing sitting as our MPs? Where Labour MPs publicly have threatened to leave the party, as some have been doing, perhaps they don’t value their Labour involvement.

So to you it’s very much not a broad tool, but a tool to be used a specific way, such as when an MP has engaged in misconduct?

I think you do have to take it case by case. It would be silly to deselect the lot, as some people argue.

In terms of bringing the party to the left, or reforming party democracy, what role do you think reselection plays?

It’s a basic matter of accountability, isn’t it? People are standing as Labour candidates – they should have the confidence and backing of their constituency parties.

Do you think what it means to be a Labour member has changed since Corbyn?

Of course the Labour party has changed in the past year, as anyone who was around in the Blair, Brown, Miliband era will tell you. It’s a completely transformed party.

Will there be a strong reaction to the release of this pamphlet from Corbyn’s opponents?

Because the main aim is to set out the rules as they stand, I don’t see how there can be – if you want to use the rules, this is how to go about it. I explicitly spelled out that it’s a level playing field – if your Corbyn supporting MP doesn’t meet the expectations of the constituency party, then she or he is just as subject to a challenge.

What do you think of the new spate of suspensions and exclusions of some people who have just joined the party, and of other people, including Ronnie Draper, the General Secretary of the Bakers’ Union, who have been around for many years?

It’s clear that the Labour party machinery is playing hardball in this election, right from the start, with the freeze date and in the way they set up the registered supporters scheme, with the £25 buy in – they’re doing everything they can to influence this election unfairly. Whether they will succeed is an open question – they will if they can get away with it.

I’ve been seeing comments on social media from people who seem quite disheartened on the Corbyn side, who feel that there’s a chance that Smith might win through a war of attrition.

Looks like a Corbyn win to me, but the gerrymandering is so extensive that a Smith win isn’t ruled out.

You’ve been in the party for quite a few years, do you think there are echoes of past events, like the push for Bennite candidates and the takeover from Foot by Kinnock?

I was around last time – it was dirty and nasty at times. Despite the narrative being put out by the Labour right that it was all about Militant bully boys and intimidation by the left, my experience as a young Bennite in Tower Hamlets Labour Party, a very old traditional right wing Labour party, the intimidation was going the other way. It was an ugly time – physical threats, people shaping up to each other at meetings. It was nasty. Its nasty in a different way now, in a social media way. Can you compare the two? Some foul things happened in that time – perhaps worse in terms of physical intimidation – but you didn’t have the social media.

There are people who say the Labour Party is poised for a split – here in Plymouth (where we don’t have a Labour MP), I’m seeing comments from both sides that emphasise that after this leadership election we need to unite to fight the Tories. What do you think will happen?

I really hope a split can be avoided, but we’re a long way down the road towards a split. The sheer extent of the bad blood – the fact that the right have been openly talking about it – a number of newspaper articles about them lining up backing from wealthy donors, operating separately as a parliamentary group, then they pretend that butter wouldn’t melt in their mouths, and that they’re not talking about a split. Of course they are. Can we stop the kamikazes from doing what they’re plotting to do? I don’t know, I hope so.

How would we stop them?

We can’t, can we? If they have the financial backing, if they lose this leadership contest, there’s no doubt that some will try. I’m old enough to remember the launch of the SDP, let’s not rule it out happening again.

We’ve talked mostly about the membership. But is Corbynism a strategy to win elections?

With the new electoral registration rules already introduced, the coming boundary changes, and the loss of Scotland thanks to decades of New Labour neglect, it will be uphill struggle for Labour to win in 2020 or whenever the next election is, under any leadership.

I still think Corbyn is Labour’s best chance. Any form of continuity leadership from the past would see the Midlands and north fall to Ukip in the same way Scotland fell to the SNP. Corbyn is actually Labour’s only chance.

Margaret Corvid is a writer, activist and professional dominatrix living in the south west.