The Great Depression did not strongly affect Japan. The Japanese economy shrank by 8% during 1929–31. However, Japan's Minister of Finance (MoF) Osachi Hamaguchi implemented the first version of Keynesian economic policies: first, by increasing deficit spending; and second, by devaluing the currency. The MoF believed that the deficit spending could easily be paid for when productivity improved.
The devaluation of the currency had an immediate effect. Japanese textiles began to displace British textiles in export markets. The deficit spending, however proved to be most profound. The deficit spending went into the purchase of munitions for the armed forces. By 1933, Japan was already out of the depression.
http://en.wikipedia.org/wiki/Great_Depression#Japan
If it wasn't the implementation of Keynesian policies, what allowed Japan to escape from the clutches of the Depression far sooner than most other countries?