European Deflation

European interest rates are near zero, and their central bank meets later in the month to announce more stimulus with the goal of keeping rates low.  Aren't rates already low?  Their economies aren't growing. The same thing can be said of Japan. 

The U.S. has stopped stimulating and economic growth is a little higher than Europe and Japan. But our interest rates are also very low.  

Does any of this seem normal to you? Should we be worried?