LyrArc Article Gist
A cut in interest rates by a quarter percentage point from the U.S. central bank is a decision that comes from the U.S. not wanting to see too wide a gap in interest rates with the European Union. Losing demand to Europe and resulting lower inflation is an outcome prevented by the U.S. acting to protect its own economy with  acut in its rate. The ECB rate at 0.4% is about 3 percentage points below the Federal Reserve's rate in the U.S.

After the cuts in rates to near zero by the central banks of U.S. and Europe following the financial crisis caused by poor lending practices of banks, the U.S. central bank began a process of bringing rates to about 3%. Lower rates near zero badly hurt savings accounts of ordinary Americans. By December 2018 the rates had reached 2.25%. 

President Trump has called for lower rates. because of the advantages it gives Europe in trade balances with a weaker currency that follows from lower interest rates. Capital flows to the country with higher rates and increases the value of the currency creating trade disadvantages and lower trade balances. WIth European interest rates much lower than the U.S. it pushes down the value of the euro vs the dollar and the British pound lower from Brexit fears. This increases European exports putting the U.S.  at a disadvantage. As the WSJ points out the U.S. central bank says though Mr. Trump is looking at trade balances and U.S. advantage, and Mr. Powell at the U.S. central bank is looking at U.S. inflation, the result for policy is the same- the U.S. acting to cut rates and stay close to what the European Union is doing.

Bond yields in Europe have dropped from a negative 0.24% to negative 0.32% with the ECB's head Mr. Draghi moving to cut rates. The announcement of Ms. Christine Lagarde as the new head of the ECB to succeed Draghi and her views to push demand up, is pushing bond yields down. The U.S. as part of the globally linked economy has to act in line with policies in Europe.