The government has lost the economic argument around immigration

It now straddles two contradictory claims.

Gus O'Donnell, the former head of the civil service, has written in an article in the Times that the government is "shooting itself in the foot" with its desire to lower immigration.

He writes (£):

A big barrier to growth is an immigration policy that deprives the UK of skilled workers in certain disciplines. Lord Heseltine, while at pains to avoid criticising the Government, clearly sympathises with the difficulties that businesses face in recruiting these workers.

O'Donnell's criticism piles on the pressure the government is facing to justify its immigration policy in economic, as well as just populist, terms. As he mentioned, Heseltine's review, No stone unturned (pdf), also tactfully steers a course rather different to that currently being pursued by the Home Office.

Heseltine writes:

It goes almost without saying that the ideal solution is a well-managed immigration system that is open and welcoming to those who can address our skills gaps and add value to the economy, yet is unattractive to those who do not have and would not get permission to be here. This is easier said than done at a time of tough manpower constraints in the public sector.

While it "almost goes without saying", that is not actually the government's own strategy. The Conservatives are locked into a damaging attempt to bring net migration in under an arbitrary cap; and worse, they have no power to affect the biggest single contributor to that number, which is intra-EU migration.

As a result, the party is forced to attack the small sliver of migration they can have an effect on. But unskilled, non-EU migration had already been extremely constrained by the previous government, so to limit immigration any further, skilled migration came under fire. Even with new strict measures on visas, the government is losing the fight miserably. Its target is net migration of 100,000 people; the latest figures show that number is 216,000.

Politically the government is failing. It has set itself a challenge which it will not – cannot – meet. That alone would be a reason for abandoning the aim now, nobly accepting defeat, even if that figure weren't one which no sane government ought to try to achieve.

Last week's Economist leader laid out the problem the economy faces as a result of this policy in stark terms:

The country has, in effect, installed a “keep out” sign over the white cliffs of Dover. Even as Mr Cameron defends the City of London as a global financial centre, and takes planeloads of business folk on foreign trips, his government ratchets up measures that would turn an entrepôt into a fortress. In the past two years the Tories have made it much harder for students and foreign workers and family members to enter and settle in the country. Britain is not only losing the war for global talent, it is scarcely competing. More people now leave to take up job offers in other countries than come the other way.

In fact, even the nascent pro-immigration voices on the right don't take the argument far enough. While many of them are content to make the argument that immigration represents a favourable trade-off between unemployment and growth, few take the extra step of point out that immigration can help with both employment and growth. This argument involves tackling head-on the pervasive "lump of labour" fallacy – the idea that there are a fixed number of jobs, and if a foreigner gets one, then a Briton can't.

Forbes blogger Adam Ozimek writes about Silicon Valley, where a similar argument is taking place after a technology journalist, Robert X Cringley, has criticised skilled-migration visas:

Imagine the worst case scenario in Cringely’s mind occurs, and a foreign worker takes a job at a 30% discount, and a native worker who could have had the job has to settle for a lower paying job. To understand the impact on U.S. workers you have to look beyond this worker who has had his job “stolen”, and must look at what economists call the general equilibrium effect. Here are other things that happen: the H1-B worker buys or rents a home, and a landlord of home seller benefits, overall, new houses will be built, meaning construction workers benefit. The H1-B worker shops at a grocery store, which employs workers, and sells goods made by farmers who also employ workers. See how this goes?

The economic case for limiting migration is thoroughly lost. At best, the government is now facing the risk that this argument filters into the popular perception; at worst, it is in the position of encouraging a popular attitude which is simply incorrect.

Placards at a protest against the decision to strip London Met university of its ability to sponsor international study. 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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Sadiq Khan gives Jeremy Corbyn's supporters a lesson on power

The London mayor doused the Labour conference with cold electoral truths. 

There was just one message that Sadiq Khan wanted Labour to take from his conference speech: we need to be “in power”. The party’s most senior elected politician hammered this theme as relentlessly as his “son of a bus driver” line. His obsessive emphasis on “power” (used 38 times) showed how far he fears his party is from office and how misguided he believes Jeremy Corbyn’s supporters are.

Khan arrived on stage to a presidential-style video lauding his mayoral victory (a privilege normally reserved for the leader). But rather than delivering a self-congratulatory speech, he doused the conference with cold electoral truths. With the biggest personal mandate of any British politician in history, he was uniquely placed to do so.

“Labour is not in power in the place that we can have the biggest impact on our country: in parliament,” he lamented. It was a stern rebuke to those who regard the street, rather than the ballot box, as the principal vehicle of change.

Corbyn was mentioned just once, as Khan, who endorsed Owen Smith, acknowledged that “the leadership of our party has now been decided” (“I congratulate Jeremy on his clear victory”). But he was a ghostly presence for the rest of the speech, with Khan declaring “Labour out of power will never ever be good enough”. Though Corbyn joined the standing ovation at the end, he sat motionless during several of the applause lines.

If Khan’s “power” message was the stick, his policy programme was the carrot. Only in office, he said, could Labour tackle the housing crisis, air pollution, gender inequality and hate crime. He spoke hopefully of "winning the mayoral elections next year in Liverpool, Manchester and Birmingham", providing further models of campaigning success. 

Khan peroration was his most daring passage: “It’s time to put Labour back in power. It's time for a Labour government. A Labour Prime Minister in Downing Street. A Labour Cabinet. Labour values put into action.” The mayor has already stated that he does not believe Corbyn can fulfil this duty. The question left hanging was whether it would fall to Khan himself to answer the call. If, as he fears, Labour drifts ever further from power, his lustre will only grow.

George Eaton is political editor of the New Statesman.