A decision was taken recently in Berlin to introduce a balanced-budget law in the German constitution. It was a hugely important decision. It may not have received due attention outside Germany given the flood of other economic and financial news. From 2016, it will be illegal for the federal government to run a deficit of more than 0.35 per cent of gross domestic product. From 2020, the federal states will not be allowed to run any deficit at all. Unlike Europe’s stability and growth pact, which was first circumvented, later softened and then ignored, this unilateral constitutional law will stick. I would expect that for the next 20 or 30 years, deficit reduction will be the first, second and third priority of German economic policy.

Anchoring the stability law at the level of the national constitution is an extreme measure – like locking the door, and throwing the keys away. It can only ever be undone with a two-thirds majority – and even a future Grand Coalition may not be able to deliver this as both of the large parties are in a process of secular decline. It means that future fiscal policy will be in the hands of the justices of Germany’s Constitutional Court. The new law replaces a much softer constitutional clause – a golden investment rule that said deficits can only be used to finance investments. It was not a satisfactory rule, but at least it allowed structural deficits in principle. The new law not only sets draconian deficit ceilings, it also provides a detailed numerical toolkit to implement the rules over the economic cycle.