Euro’s fresh lows test the ECB’s credibility story

On 13 October, the US two-year Treasury yield stood at 4.79%. That is 91 basis points above the effective federal funds rate of 3.88% recorded on 14 October. The gap is the kind of number that moves currencies. It suggests that investors in short-dated US debt are being paid to wait for a higher policy path, while the euro is being measured against a dollar carry that has not stopped climbing.

The euro slid to fresh lows against the US dollar. It also slid to fresh lows against the British pound. The second cross matters. A euro that is only weak against the greenback can be explained by a dollar rally. A euro that is weak against both suggests at least some euro-specific pressure, even if the available data do not isolate the cause.

The dollar is doing the heavy lifting

The broad US dollar index DTWEXBGS was 121.6023 on 9 October. That is a broad measure of the currency, not just a single bilateral price. Because it is broad, it points to a dollar move that is not confined to one cross. On 13 October, the US 10-year Treasury yield was 5.21%, or 42 basis points above the two-year yield. The curve is not simply inverted or steepened; it is telling investors that the front end is tight while the long end still demands compensation.

The ECB’s rate hikes are real, but they are being compared.

For a currency, the front end matters most. When the two-year yield sits well above the current policy rate, the market is pricing the possibility that the Federal Reserve has more to do, or at least that investors need to be paid for that risk. In that setting, a central bank that has already hiked can still lose ground to the dollar if the US rate path is expected to stay higher for longer. The ECB’s rate hikes are real, but they are being compared.

A credibility question, or a relative-price trade

There is a genuine dispute in how to read the phrase “despite”. One reading is that the ECB has implemented rate hikes and the euro has still made fresh lows, which raises a credibility question: if tighter policy is not supporting the currency, perhaps investors doubt the bank’s terminal rate, its growth outlook, or its ability to keep conditions tight enough.

The other reading is more mechanical. Exchange rates are relative prices. If the US side of the rate differential moves faster than the euro side, the euro can fall even when the ECB is doing what it said it would do. The broad dollar index at 121.6023 fits this view. The euro’s weakness against the pound keeps the question open.

For allocators, the channel runs through more than spot returns. A weaker euro raises the local-currency value of dollar assets for euro-based investors, but it also complicates hedging decisions because the cost of protection is tied to rate differentials. If the market begins to treat euro weakness as a policy credibility problem, European rates could face pressure to compensate holders of euro-area debt. That is the difference between a currency move and a funding condition.

What would settle it

The cleanest test is the behaviour of US front-end yields. If the euro steadies when the two-year Treasury stops climbing, the move looks like a relative-rate trade. If the euro keeps making fresh lows after the dollar rally loses momentum, the credibility reading becomes harder to dismiss.

The open question is whether the ECB can win the argument without help from the Federal Reserve.