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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In your 30s? You missed out on £26,000 and you're not even protesting

The 1980s kids seem resigned to their fate - for now. 

Imagine you’re in your thirties, and you’re renting in a shared house, on roughly the same pay you earned five years ago. Now imagine you have a friend, also in their thirties. This friend owns their own home, gets pay rises every year and has a more generous pension to beat. In fact, they are twice as rich as you. 

When you try to talk about how worried you are about your financial situation, the friend shrugs and says: “I was in that situation too.”

Un-friend, right? But this is, in fact, reality. A study from the Institute for Fiscal Studies found that Brits in their early thirties have a median wealth of £27,000. But ten years ago, a thirty something had £53,000. In other words, that unbearable friend is just someone exactly the same as you, who is now in their forties. 

Not only do Brits born in the early 1980s have half the wealth they would have had if they were born in the 1970s, but they are the first generation to be in this position since World War II.  According to the IFS study, each cohort has got progressively richer. But then, just as the 1980s kids were reaching adulthood, a couple of things happened at once.

House prices raced ahead of wages. Employers made pensions less generous. And, at the crucial point that the 1980s kids were finding their feet in the jobs market, the recession struck. The 1980s kids didn’t manage to buy homes in time to take advantage of low mortgage rates. Instead, they are stuck paying increasing amounts of rent. 

If the wealth distribution between someone in their 30s and someone in their 40s is stark, this is only the starting point in intergenerational inequality. The IFS expects pensioners’ incomes to race ahead of workers in the coming decade. 

So why, given this unprecedented reversal in fortunes, are Brits in their early thirties not marching in the streets? Why are they not burning tyres outside the Treasury while shouting: “Give us out £26k back?” 

The obvious fact that no one is going to be protesting their granny’s good fortune aside, it seems one reason for the 1980s kids’ resignation is they are still in denial. One thirty something wrote to The Staggers that the idea of being able to buy a house had become too abstract to worry about. Instead:

“You just try and get through this month and then worry about next month, which is probably self-defeating, but I think it's quite tough to get in the mindset that you're going to put something by so maybe in 10 years you can buy a shoebox a two-hour train ride from where you actually want to be.”

Another reflected that “people keep saying ‘something will turn up’”.

The Staggers turned to our resident thirty something, Yo Zushi, for his thoughts. He agreed with the IFS analysis that the recession mattered:

"We were spoiled by an artificially inflated balloon of cheap credit and growing up was something you did… later. Then the crash came in 2007-2008, and it became something we couldn’t afford to do. 

I would have got round to becoming comfortably off, I tell myself, had I been given another ten years of amoral capitalist boom to do so. Many of those who were born in the early 1970s drifted along, took a nap and woke up in possession of a house, all mod cons and a decent-paying job. But we slightly younger Gen X-ers followed in their slipstream and somehow fell off the edge. Oh well. "

Will the inertia of the1980s kids last? Perhaps – but Zushi sees in the support for Jeremy Corbyn, a swell of feeling at last. “Our lack of access to the life we were promised in our teens has woken many of us up to why things suck. That’s a good thing. 

“And now we have Corbyn to help sort it all out. That’s not meant sarcastically – I really think he’ll do it.”