The Yen's Down; the Nikkei's Up

The Nikkei 225 jumped nearly 4 per cent on Wednesday, Since the financial crisis, thaat is its tenth best day since the financial crisis. 

In this four minute, nine second video, the FT's investment editor, James Mackintosh, attributes this primarily to the weakening of the yen. 

Careful: the return recently in $s is not the same as that in ¥s.