Thinking behind "QQE with Yield Curve Control" Based on such recognition, the Bank conducted in September 2016 a comprehensive assessment of developments in economic activity and prices as well as policy effects since the introduction of QQE. In light of the findings of the assessment, it introduced "QQE with Yield Curve Control" as a means of enhancing and strengthening the previous policy frameworks.
Moreover, from the perspective of policy makers, it is considered highly important  5  to foster a better understanding of changes in market structure not only for market analyses in normal times, but also for assessing the situation in times of crises and considering countermeasures. III.