What does Miliband mean by the "structural" welfare bill?

It doesn't even need capping.

Ed Miliband will cap "structural welfare spending" if he is elected in 2015, he announced today, saying that "such a cap will alert the next Labour government to problems coming down the track and ensure that we make policy to keep the social security budget in limits."

It's not entirely clear what Miliband means by "structural" welfare spending at this point. It could just be a political fudge, designed to mimic the Conservatives' similarly fudgy focus on the "structural" deficit. The structural deficit is a particularly difficult thing to actually measure, because it relies on three pieces of information all of which are themselves uncertain: the output gap, the relation of public spending to economic growth, and the response of tax revenues to both.

Get any of them wrong, and your estimate of the structural deficit is off; get all three wrong, and you can be billions of pounds off the mark. And look at just the variation in the estimates of the output gap, via Touchstone:

But whereas the structural deficit is at least a conventional economic concept, albeit one hugely prone to measurement error, it's not entirely clear what "structural" welfare spending is, and even less clear how to cap it.

The best guess is that the structural welfare bill is the bill which we would expect to see in normal times; in other words, Labour won't view a rise in housing benefit due to the recession as a problem, but would be more concerned if, during the recovery, it fails to drop down to lower levels.

If that is the definition, then it has an interesting outcome once Labour start to cap it, because, as Declan Gaffney showed last month, "there has been no structural increase in the level of aggregate working age welfare spending for a very long time". That's because welfare spending, properly construed, must take into account foregone revenue as well as public expenditure: the most prominent example of which is tax credits. Around £3bn of the cost of tax credits in 2012/13 came from an offset to income tax. Money wasn't being "spent", but it was certainly a cost of welfare.

And when you take into account other taxation expenditures – like the mortgage interest tax relief, which was abolished in 2000 – you find that structural welfare costs have stayed remarkably stable. This chart again from Declan Gaffney's piece:

 

The real question is what "structural" welfare means for people not of working age. Because, thanks to our ageing nation, the state pension liability is growing year-on-year, and even pushing back the pension age by a year from 2026 won't help too much. Of course, it would be possible for Labour to define that increase as something other than structural – "demographic", perhaps – and thereby dodge the question. But if they don't, the key effect of this promise could be that Labour has pledged to cut pensions, two years before a general election against a party which has pledged to keep them above inflation and wage rises indefinitely.

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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Emmanuel Macron can win - but so can Marine Le Pen

Macron is the frontrunner, but he remains vulnerable to an upset. 

French presidential candidate Emmanuel Macron is campaigning in the sixth largest French city aka London today. He’s feeling buoyed by polls showing not only that he is consolidating his second place but that the voters who have put him there are increasingly comfortable in their choice

But he’ll also be getting nervous that those same polls show Marine Le Pen increasing her second round performance a little against both him and François Fillon, the troubled centre-right candidate. Her slight increase, coming off the back of riots after the brutal arrest of a 22-year-old black man and Macron’s critical comments about the French empire in Algeria is a reminder of two things: firstly the potential for domestic crisis or terror attack to hand Le Pen a late and decisive advantage.  Secondly that Macron has not been doing politics all that long and the chance of a late implosion on his part cannot be ruled out either.

That many of his voters are former supporters of either Fillon or the Socialist Party “on holiday” means that he is vulnerable should Fillon discover a sense of shame – highly unlikely but not impossible either – and quit in favour of a centre-right candidate not mired in scandal. And if Benoît Hamon does a deal with Jean-Luc Mélenchon – slightly more likely that Fillon developing a sense of shame but still unlikely – then he could be shut out of the second round entirely.

What does that all mean? As far as Britain is concerned, a Macron or Fillon presidency means the same thing: a French government that will not be keen on an easy exit for the UK and one that is considerably less anti-Russian than François Hollande’s. But the real disruption may be in the PR battle as far as who gets the blame if Theresa May muffs Brexit is concerned.

As I’ve written before, the PM doesn’t like to feed the beast as far as the British news cycle and the press is concerned. She hasn’t cultivated many friends in the press and much of the traditional rightwing echo chamber, from the press to big business, is hostile to her. While Labour is led from its leftmost flank, that doesn’t much matter. But if in the blame game for Brexit, May is facing against an attractive, international centrist who shares much of the prejudices of May’s British critics, the hope that the blame for a bad deal will be placed solely on the shoulders of the EU27 may turn out to be a thin hope indeed.

Implausible? Don’t forget that people already think that Germany is led by a tough operator who gets what she wants, and think less of David Cameron for being regularly outmanoeuvered by her – at least, that’s how they see it. Don’t rule out difficulties for May if she is seen to be victim to the same thing from a resurgent France.

Stephen Bush is special correspondent at the New Statesman. His daily briefing, Morning Call, provides a quick and essential guide to British politics.