http://blogs.wsj.com/moneybeat/2013/10/08/japans-coming-inflation/
Japan has some major economic problems. Many of them stem from a country that as a population is getting old. Another however is inflation.
If inflation were to rise drastically, Japan would have many problems with its currency. Japan already owes a huge amount of money on bonds. All of that debt will increase in how much needs to be paid out. Once that happens and they are incapable of paying it off, investors will end up creating a run on the yen. That would create a serious problem for Japan. A run on the yen would add to their debt even further which would just go in circles and keep causing problems.
These problems represent somewhat of a miss judged plan by the Japanese banks. The have failed to plan properly for an aging population. Now they are trying to force a misguided plan out there that will only make things worse because the idea that inflation is a good thing falls a little flat when you have so much debt.
