To know how much (or how little) acceleration to provide,  BIS central bankers’ speeches  3  the driver would certainly like to know his current speed. As well, he would like to know how future road conditions – like hills – are likely to affect his future speed. The FOMC’s problem is quite similar.
Therefore, we decided to reduce the monthly pace of our purchases to € billion from October onwards and we anticipate ending them after December 2018, subject to incoming data confirming our medium-term inflation outlook.