Business and finance 13 August 2013 Constraining our debt is not about left-wing or right-wing politics We must avoid the potential devastation of compound interest. Sign UpGet the New Statesman's Morning Call email. Sign-up The Roman Emperor Caligula knew about keeping people on his side – he would literally shower them with money, spraying specially minted coins from the first floor of the Forum onto an adoring crowd. But Caligula also knew that you shouldn’t do too much of it. It’s a lesson that Shadow Chancellor Ed Balls would do well to listen to. Balls is arguably one of the most controversial politicians at work today. Every part of his sensibilities appears to lie with increasing government expenditure, which translates into higher and higher government borrowing. The unholy truce he has negotiated with Labour party leader Ed Miliband to stick to the coalition’s post-2015 spending plan is nothing more than a tissue-thin tactic to get the pair, and the Labour Party, past the finishing line of the next General Election without spooking the markets. Balls’ approach to spending was forged in the heat of the administration of Gordon Brown, himself no stranger to the idea that the public purse could be extended infinitely as long as the tax take was coming in – even if it was from the City of London. But when the spring tide of money went out in 2008, the abandoned shopping carts and tangled web of detritus that is our public finances were obvious for all to see, and with it the budget deficit ballooned. The total size of our national stock of debt has been trundling steadily upwards ever since and in the next couple of years its value will hit £2trn. That’s about 120 per cent of our annual national income. But this doesn’t satisfy the shadow chancellor. Even when George Osborne announces that the deficit has not reduced as expected, Balls performs that most elegant of political pirouettes that sees him telling us that our borrowing is both shockingly large and, simultaneously, not enough. In the City the collective slapping of foreheads is audible – political rhetoric and word play doesn’t really have a place for those trying to work their way through delicately balanced financial markets that are – simultaneously – incredulous and credulous that we are where we are or that our current borrowing can be sustained. Advocating government spending control is more than usually associated with "being right wing". But "the right wing" have lots to gain from increased government debt; company profits rise and with it the value of shares. City traders could "short" our currency and bond markets in order to make a profit as they fall. So it’s frustrating that the debate over government spending is lazily classified as a "right versus left" clash. In fact the main goal of the Deficit Constrainers is to stop the God of Compound Interest from taking over our public finances; when you have to start borrowing to pay your interest bill you don’t have to be a customer of Wonga.com to understand you are in trouble. And that is where the UK is. Deficit Constrainers, by and large, want a situation that is out of control brought under control, because in their view the ultimate cost to society of an ever-increasing interest bill is greater than standing back and wilfully ignoring that it is happening. For a graphic illustration of where this ends take a look at the images of Greece and Argentina that have flitted across our screens in recent years – societies devastated by the effects of a national debt out of control when compounding took over. You think it can’t happen here? Think again – because it isn’t political, it’s mathematics. And this is why Ed Balls is so dangerous – he appears to treat our national finances and the debate around them as a vehicle for political power rather than the national good. From the apparent policy tensions and by Balls’ own recent Commons performances it is conceivable that he could split from the Labour Party and join a new left-leaning organization whose main agenda is expanding public expenditure leaving behind a party struggling to differentiate itself from the others. Alternatively, he could stay in the Labour Party, who are then elected in 2015 on the basis of who they aren’t, and begin a Caligulaean campaign to increase expenditure from within government. Either way, after the silly season and the post-Carney carnival has moved on and we are faced once more with our realities, the attitude of Ed Balls towards government expenditure will have much more significance for how the markets view us than we are currently allowing for. › Inflation falls to 2.8% It’s frustrating that the debate over government spending is lazily classified as a "right versus left" clash. Photograph: Getty Images Head of Fixed Income and Macro, Old Mutual Global Investors Subscribe For daily analysis & more political coverage from Westminster and beyond subscribe for just £1 per month!