THE FATE of the euro was always going to depend on Italy. With annual GDP of more than €1.6trn ($ 1.9trn), about 15% of euro-area output and debt of nearly €2.3trn, it poses a challenge to the single currency that Europe seems unable to manage but cannot avoid. Matters are now coming to a head, as Italy’s new coalition government instigates a showdown over the European Union’s fiscal rules. The disagreement might well become disastrous. But it is also an opportunity for the euro zone to begin building a better, more durable approach to fiscal policy.
Trouble began earlier this year when the populist Five Star movement, led by Luigi Di Maio, formed a government with the right-wing Northern League, led by Matteo Salvini. Both promised budget goodies: Mr Salvini a hefty tax cut and Mr Di Maio a basic minimum income. Such largesse may test the deficit limit of 3% set by the EU’s stability and growth pact. And it seems certain to break other fiscal rules set by the bloc: the government’s initial budget plan is…