The challenge for the BOJ will be how to back away from QQE without scaring investors into a stampede out of government bonds
Says BoJ's negative rate policy has not reached its limits
There is some concern about Bank of Japan Governor Haruhiko Kuroda's monetary easing policy
The debate underscores the challenges the central bank face as it attempts to address stagnant price growth and entrenched economic weakness with a dwindling set of policy tools
A dollar-lending facility was also expanded, the BoJ said in a statement in Tokyo on Friday
Bank of Japan's move is also yielding pressure from government and financial markets to act towards attaining 2% inflation target
The BOJ earlier held its key interest rate at minus 0.1% and kept the annual target for expanding the monetary base at 80 trillion yen ($764 bn)
BOJ's current accounts have ballooned five times since BOJ Governor Haruhiko Kuroda began his plan to buy JGBs
Rates left unchanged at negative value
Central bank carefully watching market developments, says Governor Haruhiko Kuroda