At the recent meeting of the bank of central banks, the BIS, central bankers met to discuss unconventional measures to fight deflation, such ass buying financial assets. After having massively inflated financial markets, they are now worried that the situation is unsutainable.
http://money.cnn.com/2003/06/29/news/international/bis.reut/index.htm
According to several central bankers attending the discussion, Federal Reserve Chairman Alan Greenspan said measures once considered unorthodox might become conventional, such as buying financial assets.
“We used to watch only commodity prices, exchange rates and interest rates, but now it seems we also have to examine or monitor asset prices,” said one.