It's a matter of fact that Japan's interest rates have been simply too lowThat is undeniably contributing to the yen's weaknessIf this continues, it could accelerate inflation and BOJ really needs to take this into considerationYen is still too weak from a historical perspectiveThere's no reason why the yen shouldn't strengthen significantly from hereGyoten is a long-time servant of Japan's bureaucracy as he was involved in the 1985 Plaza Accord negotiations, serving as director-general of the International Finance Bureau at Japan's Ministry of Finance at the time. Taking that into consideration, I reckon you can see why he would assert a bold opinion - one which the BOJ would not ascribe to, at least not out loud. Then again, he is at least consistent in his view as he also did oppose when Japan chose to sell the yen back in 2010, which was the first since 2004 at the time. USD/JPY was trading around 82.87 before the intervention struck back then. Wild times. This article was written by Justin Low at investinglive.com.