While it has not yet provided a precise timetable, it made it clear that it will happen sooner rather than later, barring an unforeseen deterioration of the economy, both in terms of employment and growth and of course the health situation. Economists believe a decision will be made between the Jackson Hole symposium and the Fed's September 21-22 policy meeting.

Currently, the buyback program reaches $120 billion per month. The envelope is expected to be reduced gradually, perhaps starting at the end of the year, which is a bummer for investors who are used to swimming in a pool full of liquidity.

How can the Fed reduce support without penalizing financial markets too much? That is the question.

How to empty the cash pool? (By Amandine Victor)