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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Could Labour lose the Oldham by-election?

Sources warn defeat is not unthinkable but the party's ground campaign believe they will hold on. 

As shadow cabinet members argue in public over Labour's position on Syria and John McDonnell defends his Mao moment, it has been easy to forget that the party next week faces its first election test since Jeremy Corbyn became leader. On paper, Oldham West and Royton should be a straightforward win. Michael Meacher, whose death last month triggered the by-election, held the seat with a majority of 14,738 just seven months ago. The party opted for an early pre-Christmas poll, giving second-placed Ukip less time to gain momentum, and selected the respected Oldham council leader Jim McMahon as its candidate. 

But in recent weeks Labour sources have become ever more anxious. Shadow cabinet members returning from campaigning report that Corbyn has gone down "very badly" with voters, with his original comments on shoot-to-kill particularly toxic. Most MPs expect the party's majority to lie within the 1,000-2,000 range. But one insider told me that the party's majority would likely fall into the hundreds ("I'd be thrilled with 2,000") and warned that defeat was far from unthinkable. The fear is that low turnout and defections to Ukip could allow the Farageists to sneak a win. MPs are further troubled by the likelihood that the contest will take place on the same day as the Syria vote (Thursday), which will badly divide Labour. 

The party's ground campaign, however, "aren't in panic mode", I'm told, with data showing them on course to hold the seat with a sharply reduced majority. As Tim noted in his recent report from the seat, unlike Heywood and Middleton, where Ukip finished just 617 votes behind Labour in a 2014 by-election, Oldham has a significant Asian population (accounting for 26.5 per cent of the total), which is largely hostile to Ukip and likely to remain loyal to Labour. 

Expectations are now so low that a win alone will be celebrated. But expect Corbyn's opponents to point out that working class Ukip voters were among the groups the Labour leader was supposed to attract. They are likely to credit McMahon with the victory and argue that the party held the seat in spite of Corbyn, rather than because of him. Ukip have sought to turn the contest into a referendum on the Labour leader's patriotism but McMahon replied: "My grandfather served in the army, my father and my partner’s fathers were in the Territorial Army. I raised money to restore my local cenotaph. On 18 December I will be going with pride to London to collect my OBE from the Queen and bring it back to Oldham as a local boy done good. If they want to pick a fight on patriotism, bring it on."  "If we had any other candidate we'd have been in enormous trouble," one shadow minister concluded. 

Of Corbyn, who cancelled a visit to the seat today, one source said: "I don't think Jeremy himself spends any time thinking about it, he doesn't think that electoral outcomes at this stage touch him somehow."  

George Eaton is political editor of the New Statesman.