The devastation caused by the earthquake and tsunami may lead to an emergency budget
The Bank of Japan (BOJ) will inject 15 trillion yen ($183bn; £114bn) into the country's banking system to stabilise markets.
Masamichi Adachi, a senior economist for Japan at JP Morgan in Tokyo, explains why this cash injection is so important and what the Bank of Japan hopes to achieve.
So why has there been a cash injection?
How big is this cash injection?
So what policy changes are we likely to see?
What might those side effects be?
What effects do you see on the yen in the short term?
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