TOKYO (REUTERS) - The recent volatility in the Japanese stock market is not surprising as it is natural for stock prices to move randomly, Mr Koichi Hamada, a special economic adviser to Prime Minister Shinzo Abe, said on Thursday.

Mr Hamada, speaking to reporters, also said he is not worried about the rise in Japan's long-term yield as real interest rates remain low.

The Nikkei share average dived to a five-week low on Thursday as the yen firmed further against the dollar.