The Nikkei fell away during trading today (November 29th), but still posted its best overall result for November since 2005.
It lost 0.4 per cent of its value but was still 9.3 per cent up for the month as the yen lost ground against the dollar and the euro.
The yen is now down to a five-year low against the euro, which has helped to support major exporters on the Nikkei in recent weeks.
Japanese consumer inflation accelerated to a five-year high in data released today and this has also been a boost for the index, Reuters reports.
"Industrial production was good but it was below consensus. Gradually, the market is coming to believe the BOJ will be forced to react again sometime next year," said Kyoya Okazawa, head of global equities and commodity derivatives at BNP Paribas in Tokyo.
Much of the Nikkei's good performance for the week was made up by the 1.8 per cent it increased to, closing in on a new six-year high for the index.
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