The European Central Bank has fired its magic bullet. By promising “unlimited” purchases of sovereign bonds, Mario Draghi, the ECB’s president, may have kept his pledge to do “whatever it takes” to save the euro. But in rescuing the currency, Mr Draghi’s magic bullet has badly wounded something even more important – democracy in Europe.

As a result of the ECB’s actions, voters from Germany to Spain will increasingly find that crucial decisions about national economic policy can no longer be changed at the ballot box. In Germany, in particular, there is a growing realisation that the ECB, an unelected body that prides itself on its independence from government, has just taken a decision that has profound implications for German taxpayers – but one that they cannot challenge or change.

Previous European bailouts had to be approved by the German parliament and were subject to review by the German courts. Indeed the German supreme court will rule on the constitutionality of the most recent bailout, tomorrow. But the ECB’s decision to accept unlimited bond purchases is immune to such democratic controls. The bank cannot be overruled by the German parliament. And because it is an EU institution, the ECB cannot be checked by the German courts – only by the European Court of Justice.