The stock exchanges are waiting. Like the best poker players, after running in October and November, they are now at the window. They are waiting, in a crescendo of volatility, to see what cards the Fed and ECB (not forgetting the BoE) will put on the table next week. All trying to grasp, in every data or information, the cue to anticipate the moves of the central banks themselves. This was the case, for example, with regard to producer prices in the US published yesterday. L…