Japan's central bank has surprised markets with the size of its latest stimulus package, as it tries to spur growth and end years of falling prices.
The move was seen as a clear signal by the bank's new boss, Haruhiko Kuroda, that he was willing to spend heavily to achieve an inflation target of 2%.
The bank said it would increase its purchase of government bonds by 50 trillion yen ($520bn; £350bn) per year.
That is the equivalent of almost 10% of Japan's annual gross domestic product.So maybe the 'zero bound' liquidity trap theory will be tested.
At any rate, the Japanese people are putting their money where there expectations are;
The yen fell against the US dollar, and Tokyo's Nikkei 225 index rose 2.2% on the central bank's decision, indicating markets were reacting positively to the extent of the stimulus measures.