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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Want to send a positive Brexit message to Europe? Back Arsene Wenger for England manager

Boris Johnson could make a gesture of goodwill. 

It is hard not to feel some sympathy for Sam Allardyce, who coveted the England job for so many years, before losing it after playing just a single match. Yet Allardyce has only himself to blame and the Football Association were right to move quickly to end his tenure.

There are many candidates for the job. The experience of Alan Pardew and the potential of Eddie Howe make them strong contenders. The FA's reported interest in Ralf Rangner sent most of us scurrying to Google to find out who the little known Leipzig manager is. But the standout contender is Arsenal's French boss Arsene Wenger, 

Would England fans accept a foreign manager? The experience of Sven Goran-Eriksson suggests so, especially when the results are good. Nobody complained about having a Swede in charge the night that England won 5-1 in Munich, though Sven's sides never won the glittering prizes, the Swede proving perhaps too rigidly English in his commitment to the 4-4-2 formation.

Fabio Capello's brief stint was less successful. He never seemed happy in the English game, preferring to give interviews in Italian. That perhaps contributed to his abrupt departure, falling out with his FA bosses after he seemed unable to understand why allegations of racial abuse by the England captain had to be taken seriously by the governing body.

Arsene Wenger could not be more different. Almost unknown when he arrived to "Arsene Who?" headlines two decades ago, he became as much part of North London folklore as all-time great Arsenal and Spurs bosses, Herbert Chapman or Bill Nicholson, his own Invicibles once dominating the premier league without losing a game all season. There has been more frustration since the move from Highbury to the Emirates, but Wenger's track record means he ranks among the greatest managers of the last hundred years - and he could surely do a job for England.

Arsene is a European Anglophile. While the media debate whether or not the FA Cup has lost its place in our hearts, Wenger has no doubt that its magic still matters, which may be why his Arsenal sides have kept on winning it so often. Wenger manages a multinational team but England's football traditions have certainly got under his skin. The Arsenal boss has changed his mind about emulating the continental innovation of a winter break. "I would cry if you changed that", he has said, citing his love of Boxing Day football as part of the popular tradition of English football.

Obviously, the FA must make this decision on football grounds. It is an important one to get right. Fifty years of hurt still haven't stopped us dreaming, but losing to Iceland this summer while watching Wales march to the semi-finals certainly tested any lingering optimism. Wenger was as gutted as anybody. "This is my second country. I was absolutely on my knees when we lost to Iceland. I couldn't believe it" he said.

The man to turn things around must clearly be chosen on merit. But I wonder if our new Foreign Secretary Boris Johnson - albeit more of a rugger man himself - might be tempted to quietly  suggest in the corridors of footballing power that the appointment could play an unlikely role in helping to get the mood music in place which would help to secure the best Brexit deal for Britain, and for Europe too.

Johnson does have one serious bit of unfinished business from the referendum campaign: to persuade his new boss Theresa May that the commitments made to European nationals in Britain must be honoured in full.  The government should speed up its response and put that guarantee in place. 

Nor should that commitment to 3m of our neighbours and friends be made grudgingly.

So Boris should also come out and back Arsene for the England job, as a very good symbolic way to show that we will continue to celebrate the Europeans here who contribute so much to our society.

British negotiators will be watching the twists and turns of the battle for the Elysee Palace, to see whether Alain Juppe, Nicolas Sarkozy end up as President. It is a reminder that other countries face domestic pressures over the negotiations to come too. So the political negotiations will be tough - but we should make sure our social and cultural relations with Europe remain warm.

More than half of Britons voted to leave the political structures of the European Union in June. Most voters on both sides of the referendum had little love of the Brussels institutions, or indeed any understanding of what they do.

But how can we ensure that our European neighbours and friends understand and hear that this was no rejection of them - and that so many of the ways that we engage with our fellow Europeans rom family ties to foreign holidays, the European contributions to making our society that bit better - the baguettes and cappuccinos, cultural links and sporting heroes remain as much loved as ever.

We will see that this weekend when nobody in the golf clubs will be asking who voted Remain and who voted Leave as we cheer on our European team - seven Brits playing in the twelve-strong side, alongside their Spanish, Belgian, German, Irish and Swedish team-mates.

And now another important opportunity to get that message across suddenly presents itself.

Wenger for England. What better post-Brexit commitment to a new Entente Cordiale could we possibly make?

Sunder Katwala is director of British Future and former general secretary of the Fabian Society.