Lagarde's 'unwarranted' warning raises a bigger question: who decides?

Here we go once more. Just as it begins to look as though bond investors are finally making governments pay for their fiscal choices, the ECB shows up with a reminder that it still has rescue measures at its disposal. That timing is rather convenient.

Speaking yesterday, ECB President Lagarde said the central bank is equipped to counter 'unwarranted' market dynamics, a comment clearly tied to the stress gripping European bond markets.

I have no objection to the ECB intervening when markets are truly dysfunctional. But her statement leaves one concern: what exactly is an 'unwarranted' market move in this case?

Drawing the connection to France requires no great effort. The government there is running a budget deficit above 5% of GDP, with public debt close to 120% of GDP. At the same time, political deadlock is preventing any meaningful fiscal reform from advancing.

So when investors demand higher yields to be compensated for those risks, isn't the bond market just fulfilling its purpose? At what moment does a fair repricing of fiscal risk become an occasion for central bank intervention? Where exactly is the line, and who has the authority to draw it?

The ECB's Transmission Protection Instrument (TPI) is meant for disorderly market conditions that endanger monetary policy transmission. It is not a tool for letting governments dodge the consequences of their own fiscal missteps.

In that context, France's ongoing excessive deficit procedure raises the question of whether it would even be eligible for intervention under the ECB's existing framework. That is exactly why Lagarde's wording deserves close examination, I would argue.

The ECB should stay in its lane and stick to its mandate of ensuring price stability, rather than protecting governments from the results of poor fiscal choices. If its intervention edges toward a backdoor bailout, the boundary between monetary policy and fiscal backing gets blurred. That is a dangerous precedent to set.

Think about it. If politicians can count on the ECB to eventually come to the rescue whenever borrowing costs become too uncomfortable, why would they make the tough fiscal decisions at all?

Face facts: investor messages that governments do not appreciate are not in themselves proof that the bond market is broken.