And you thought the ECB was a truly independent central bank? The Economist also has an article that touches on this issue:
There's a huge problem with the entire world trying to have weaker currencies relative to the dollar right now.
It's that they've all become slaves to U.S. interest rate policy, even more so than they already may have been.
Right now, raising interest rates in any country before the U.S. does so is likely to strengthen that country's currency against the dollar, all else being equal.
For countries with a strong desire to keep exports competitive, that's a big problem.
Thus the Eurozone, the U.K., and most international countries have to decide whether their own fear of currency strength is worth the collateral damage it causes at home.
Note that this means the Fed is setting global liquidity conditions, just as it did during the early-to-mid 2000s. The Fed's official mandate is the U.S. economy, but its reach is global.
The ECB will eventually face a problem that some central banks are already encountering. As long as America keeps its interest rates low, attempts by others to tighten policy (even stealthy ones that leave benchmark rates unchanged) are likely to mean a stronger currency. That is a price that Australia’s central bank seems prepared to pay. The minutes of its policy meeting on October 6th, at which it raised its main interest rate, revealed the exchange rate was not a consideration. The bank’s rate-setters ascribed the Australian dollar’s rise to the economy’s resilience and strong commodity prices. In New Zealand, similarly, the central-bank governor, Alan Bollard, told politicians that the kiwi dollar’s strength would not stand in the way of higher rates.