ECB: Quantitative Easing Or Tightening?

 | Sep 15, 2014 06:22AM ET

Charles Wyplosz at VoxEU questions the potential effectiveness of quantitative easing (QE) as recently announced by the ECB. His main concern is that the ECB version of QE is supply driven, as opposed to the one implemented by the other central banks which is demand driven.

In the case of the US Federal Reserve or the Bank of England, the central bank buys securities and those securities permanently increase the size of the bank's balance sheet. Liquidity is provided regardless of the actions of commercial banks. In contrast, the ECB so far had always relied on the demand from commercial banks for liquidity. The ECB made loans available to commercial banks, and as long as commercial banks demanded those loans, the balance sheet of the central bank also increased (with the deposits of commercial banks being the liability that appears on the other side). But this means that in many ways commercial banks are driving QE. It is their desire to hold more liquidity the one that determines the expansion (or contraction) in the size of the ECB balance sheet.

To understand these dynamics, here are some charts from the ECB web site. First the total size of the balance sheet of the ECB.