Growth doesn't just mean using more resources. It also means using less

If you can do something for one ten-thousandth the cost it used to be, you'll feel pretty rich.

The Atlantic's Noah Smith has written on whether capitalism actually does require growth to continue. He argues:

Looking at history, we see that the biggest challenges to capitalism actually came during times of rapid growth. The early 20th Century was the heyday of communism, anarchism, and socialism. But this was a time of immense growth, technological progress, and increased material standards of living. It seems possible that those alternatives to capitalism gained popularity precisely because rapid growth disrupted the stable social systems that had been in place before the Industrial Revolution.

Clearly there's something problematic in that analysis; the "stable social systems" in place before the Industrial Revolution had very little in common with capitalism as we know it today. It may well be the case that the age the joint-stock company didn't require growth in the same way that modern financial capitalism does.

Smith does, however, argue that finance doesn't require growth either, because interest comes not just from an expectation of growth but also the value of consumption smoothing. That is, people will put up with having less money in the future in order to have income now, and interest is a reflection of that.

But the whole argument is rather a moot point, either way, because it's so frequently brought up in the context of a second claim: that growth requires exploitation of resources, and that if we desire an economy which doesn't carry on tearing up the planet, we need to accept that that economy will be "steady state".

There is clearly a grain of truth here. Famously, the history of America can be described, in economic terms, as a country continually dealing with financial issues by physically growing; first expanding south, then west, and then eventually overseas in the form of the pseudo-protectorates the US now runs. And an end to resource extraction would definitely hit growth rates enormously, if for no other reason than that it would require the world's economy to be completely retooled around renewable energy and recycling usable material from waste, which wouldn't happen painlessly.

But it's simply not true to say that growth can only come from increased abuse of the environment. My favourite illustration of the falsehood comes from a two-year-old piece by Alexis Madrigal:

Imagine you've got a shiny computer that is identical to a Macbook Air, except that it has the energy efficiency of a machine from 20 years ago. That computer would use so much power that you'd get a mere 2.5 seconds of battery life out of the Air's 50 watt-hour battery instead of the seven hours that the Air actually gets. That is to say, you'd need 10,000 Air batteries to run our hypothetical machine for seven hours. There's no way you'd fit a beast like that into a slim mailing envelope.

That, right there, is growth. For the energy cost of running one laptop twenty years ago, you can now run 10,000. That's an annual growth rate of just under 60 per cent.

Clearly, energy efficiency in portable computers over the last 20 years is one of the most rapid measurable increases in technology ever, but nonetheless, it puts paid to the idea that all growth can be is increasingly extractive.

We should be planning for an economy which takes only memories and leaves only footprints — but that's not the same as planning for an economy with no growth. Though George Osborne might wish to convince you otherwise, that would be an unnecessary disaster for all concerned.

Some MacBook Airs, engaged in naughtiness. 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.

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En français, s'il vous plaît! EU lead negotiator wants to talk Brexit in French

C'est très difficile. 

In November 2015, after the Paris attacks, Theresa May said: "Nous sommes solidaires avec vous, nous sommes tous ensemble." ("We are in solidarity with you, we are all together.")

But now the Prime Minister might have to brush up her French and take it to a much higher level.

Reuters reports the EU's lead Brexit negotiator, Michel Barnier, would like to hold the talks in French, not English (an EU spokeswoman said no official language had been agreed). 

As for the Home office? Aucun commentaire.

But on Twitter, British social media users are finding it all très amusant.

In the UK, foreign language teaching has suffered from years of neglect. The government may regret this now . . .

Julia Rampen is the editor of The Staggers, The New Statesman's online rolling politics blog. She was previously deputy editor at Mirror Money Online and has worked as a financial journalist for several trade magazines.