some dramatic movements on the tokyo stock exchange this morning. the nikkei lost as much as 3% afterjapan s central bank tweaked its longstanding monetary easing programme, in a surprise move that also saw the yen strengthen quickly against the dollar. after a two day policy meeting, the bank said it would widen the band in which it would allow rates for 10 year japan government bonds to move, saying it would improve market functioning. and here you can see what the nikkei is doing right now. it is down 2.52%. but, as widely expected, the b0] kept its minus 0.1% target for short term interest rates and 0% for the 10 year government bond yield unchanged. so why, when most of the world s big economies are on a rate rising path, does japan stand out like this? joining me now is seijiro takeshita, dean professor at the school of management