BoJ is buying etf as part of its qqe programme, not targeting certain stock price level

Better to maintain BoJ's pledge to increase its jgb holding at 80 trln yen per year

BoJ can guide monetary policy more flexibly by maintaining the bond-buying pledge, removing it could cause unnecessary market turmoil

Don't need to change BoJ's inflation forecasts just from temporary fluctuations in oil prices

Oil prices may fluctuate but likely to move up as a trend

See little chance Japan's economy will worsen but if it does on big external shock, BoJ can top up stimulus