Bloomberg report on the Bank of Japan stepping back in to buy ETFs:

"The BOJ buys ETFs mechanically" and tends to put in buy orders after the Topix closes down in the morning session, said Norihiro Fujito, a senior strategist at Mitsubishi UFJ Morgan Stanley Securities Co. in Tokyo. "The central bank passed on buying ETFs in October simply because stocks continued to rise. In turn, it came in to buy in November just because the market is adjusting from the rally."

Article is here for more, something to bear in mind

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Ohhh ... I do like this part of the quote ... "market is adjusting from the rally"

Is that what the kids are calling it nowadays? :-D