QE is a special instrument used when a central bank’s short- and medium-term policy rates are already at zero and it wants to lower long-term interest rates. This implies that QE can be effective only in economies in which changes in long-term (market) interest rates play an important role in the private sector.
但是，在欧元区，用QE响应这一呼吁大有问题。QE是一种特殊工具，在央行短期和中期政策利率已经接近于零并且希望降低长期利率时使用。这意味着QE只有在长期（市场）利率变化对私人部门影响的重大的经济中才有效。