The behaviour of the world’s two main central banks, and the relationship between them, have profound effects on global financial markets. As a broad rule of thumb, the ECB (and the Bundesbank before it) have tended to act in a very similar manner to the Fed, except about 6-12 months later. In fact, that is one of the most well established rules in the analysis of monetary policy making.
It does not imply that the ECB deliberately “copies” the Fed, which it clearly does not do. But it does imply that circumstances have usually produced this symbiotic relationship between the two key central banks. When this relationship has been broken in the past, it has usually spelled trouble. Read more