For years, central banks believed they knew how to fight inflation. When prices rose, they raised interest rates; when they eased, rates could be relaxed. It was an imperfect but relatively predictable mechanism. That playbook no longer works. The European Central Bank decided yesterday to hold interest rates and, more than a pause in the monetary cycle, the decision reflects something far deeper: the end of certainties. Inflation remains a threat, but its causes no longer respond solely to the behaviour of demand, wages or credit. Wars, energy, trade fragmentation and geopolitics have moved to centre stage in monetary policy. The ECB is no longer simply managing the economic cycle. It is trying to navigate a world where risks change faster than the models traditionally used to analyse them.

Just a month ago, the ECB raised rates — something I described in this very column as a clear error of diagnosis; yesterday it decided to wait, which is in itself good news. However, one should not confuse a pause with a lesson learned. It does not mean the ECB considers the fight against prices over, nor by any means that it rules out further hikes. What it signals is, simply, that the room to act with conviction is today far narrower than it was a few years ago. The latest data have shown a somewhat greater-than-expected moderation in certain components of inflation, while European economic activity continues to hold up better than forecast. At the same time, oil is rising in price again, natural gas is regaining tension, the conflict between the United States and Iran has reopened questions about the Strait of Hormuz, and energy markets are once again becoming a source of uncertainty. In that context, holding rates is not a gesture of complacency. It is an implicit acknowledgement that the ECB needs more information before moving a piece that affects the entire European economy.

The July meeting marks, in all likelihood, the end of a phase. Until now, the question was how much to raise rates. From now on, the question will be when to stop using them as an almost automatic response to any uptick in inflation. Monetary policy has become far more data-dependent and, above all, far more dependent on events that lie beyond the control of central banks. Christine Lagarde indicates that each meeting will stand on its own and that decisions will be taken based on the information available at the time. It may sound like a well-worn formula, but it has never been more true. Today, in Frankfurt, natural gas prices, the evolution of shipping freight rates and tensions in the Middle East are analysed with the same interest as wages or bank credit. Geopolitics has now become part of the macroeconomic picture with the same intensity as traditional monetary variables.

That does not mean September has disappeared from the horizon. Quite the opposite. If energy prices continue rising through the summer and that increase ultimately feeds through to other goods and services, the ECB could find itself forced to raise rates again. That possibility remains open and would be consistent with its price stability mandate. In any case, it is worth distinguishing between the capacity to react and the obligation to do so. Not every bout of inflation demands the same response. Inflation driven by war, an energy supply disruption or a trade blockade poses a far more complex dilemma than inflation generated by excess demand. Central banks can prevent a temporary shock from ultimately contaminating expectations and wage negotiations. What they cannot do is eliminate the source of the problem.

That risk is particularly relevant because the European economy continues to face structural challenges that have little to do with the level of interest rates. Productivity growth remains slow, private investment stays below the levels required by technological transformation, and the gap with the United States and China continues to widen in strategic sectors such as artificial intelligence, semiconductors and the digital economy. The energy transition and digitalisation require enormous volumes of investment at precisely the moment when financing costs remain elevated. Keeping monetary conditions highly restrictive for too long may end up delaying business projects that are essential for improving Europe's potential growth, while at the same time failing to guarantee a permanent reduction in an inflation whose origins remain, to a significant degree, external.

This is not about questioning the ECB's mandate. Price stability remains the indispensable condition for sustainable growth. Nor is it about demanding a looser monetary policy as a matter of principle. It is about acknowledging that the world has changed and that the inflation of 2026 bears little resemblance to that of four years ago. Back then, demand excesses accumulated in the aftermath of the pandemic were the dominant force. Today, geopolitical tensions, the fragmentation of international trade, energy vulnerability and a far more unpredictable global environment carry far greater weight. The monetary response cannot be identical when the nature of the problem has changed. Thursday's pause does not resolve that dilemma. However, it does acknowledge, perhaps for the first time with full clarity, that European monetary policy has definitively entered a new era — one in which managing uncertainty will be just as important as controlling inflation.