When the deficit's "under control", will the Conservatives be able to resist deficit-funded tax cuts?

There's no reason why they should even try.

Matt Yglesias asks what could be an existential question for conservatives on both sides of the Atlantic:

This is the question for John Boehner and Paul Ryan whenever they do unveil their balanced-budget plan: Why not make taxes lower instead of balancing the budget? The budget will, presumably, cut spending down to a level that conservatives think is appropriate. Say that sums up to 18 percent of GDP. Well if you're spending 18 percent of GDP and 18 percent of GDP is the right amount to spend, then why is it better to raise 18 percent of GDP in taxes rather than raise 16 percent and borrow the rest?

For the time being, in Britain and America, rhetoric about "getting the deficit under control" and about "shrinking the size of the state" are pointing in the same direction. Both are reasons for the massive spending cuts which the Conservatives and Republicans have attempted to enact.

Most of the attacks on the false connection between those two arguments have been focused on the "shrinking the state" part of the equation. That is, questions like "if we're trying to reduce the deficit, why aren't we raising taxes on the rich/on bankers/on financial transactions" are appropriate for exposing the drive for deficit reduction as a sham, driven largely by ideology.

But what if, instead, we accept — hypothetically — that the size of the state had to be shrunk. Eventually, spending would be "under control", whatever that means for them, and the choice would become whether taxes ought to be at the same level. Why, all things considered, would it be bad if they weren't? Yglesias asks:

Is it because a 2 percent of GDP budget deficit would be inflationary? Is it because an inflation-targeting central bank faced with a 2 percent of GDP budget deficit would be forced to peg short-term interest rates at a high level? What's the problem, exactly, that the budget balancing solves once we've stipulated that spending has been cut to an appropriate level?

Of course, in the political world, we would be unlikely to get such a clear answer to that question. Rhetoric about a "maxed-out credit card", "paying off the country's mortgage" or "unsustainable budget deficits" — where "sustainable" is never defined — dodges the fact that the macroeconomics of small persistent budget deficits in a country which controls its own currency are relatively settled: it's fine. And chances are that if the Conservatives do manage to get the deficit down, and cling on to power through 2015, then they will do the obvious thing, and enact deficit-funded tax cuts.

But getting a straight answer to that question from the economically minded people who call for swingeing spending cuts now would be interesting indeed.

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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Emily Thornberry heckled by Labour MPs as tensions over Trident erupt

Shadow defence secretary's performance at PLP meeting described as "risible" and "cringeworthy". 

"There's no point trying to shout me down" shadow defence secretary Emily Thornberry declared midway through tonight's Parliamentary Labour Party meeting. Even by recent standards, the 70-minute gathering was remarkably fractious (with PLP chair John Cryer at one point threatening to halt it). Addressing MPs and peers for the first time since replacing Maria Eagle, Thornberry's performance did nothing to reassure Trident supporters. 

The Islington South MP, who voted against renewal in 2007, said that the defence review would be "wide-ranging" and did not take a position on the nuclear question (though she emphasised it was right to "question" renewal). She vowed to listen to colleagues as well as taking "expert advice" and promised to soon visit the Barrow construction site. But MPs' anger was remorseless. Former shadow defence minister Kevan Jones was one of the first to emerge from Committee Room 14. "Waffly and incoherent, cringeworthy" was his verdict. Another Labour MP told me: "Risible. Appalling. She compared Trident to patrolling the skies with spitfires ... It was embarrassing." A party source said afterwards that Thornberry's "spitfire" remark was merely an observation on changing technology. 

"She was talking originally in that whole section about drones. She'd been talking to some people about drones and it was apparent that it was absolutely possible, with improving technology, that large submarines could easily be tracked, detected and attacked by drones. She said it is a question of keeping your eye on new technology ... We don't have the spitfires of the 21st century but we do have some quite old planes, Tornadoes, but they've been updated with modern technology and modern weaponry." 

Former first sea lord and security minister Alan West complained, however, that she had failed to understand how nuclear submarines worked. "Physics, basic physics!" he cried as he left. Asked how the meeting went, Neil Kinnock, who as leader reversed Labour's unilateralist position in 1989, simply let out a belly laugh. Thornberry herself stoically insisted that it went "alright". But a shadow minister told me: "Emily just evidently hadn't put in the work required to be able to credibly address the PLP - totally humiliated. Not by the noise of the hecklers but by the silence of any defenders, no one speaking up for her." 

Labour has long awaited the Europe split currently unfolding among the Tories. But its divide on Trident is far worse. The majority of its MPs are opposed to unilateral disarmament and just seven of the shadow cabinet's 31 members share Jeremy Corbyn's position. While Labour MPs will be given a free vote when the Commons votes on Trident renewal later this year (a fait accompli), the real battle is to determine the party's manifesto stance. 

Thornberry will tomorrow address the shadow cabinet and, for the first time this year, Corbyn will attend the next PLP meeting on 22 February. Both will have to contend with a divide which appears unbridgeable. 

George Eaton is political editor of the New Statesman.