Nevertheless, it is difficult to technically prove my view that QQE has brought about improvements in Japan's economy, because it is impossible to compare the situation of the economy from 2013 up to the present between cases where QQE has been implemented and where QQE has not been implemented.
What I can compare is merely the situation before the implementation of QQE -- that is, until 2012 -- and after the implementation -- from 2013. Because the economic situation differs between these periods, the effects of QQE cannot be technically proven by this comparison. Given this, it is necessary to terminate QQE now in order to make my argument more convincing.