Printing money, QE, Jim Rogers, etc...
http://finance.yahoo.com/blogs/breakout/fed-ruining-entire-class-investors-says-jim-rogers-153315477.html
US stock market has been rising steadily albeit slowly. Here's a bear telling how he sees the market:
http://finance.yahoo.com/blogs/breakout/market-rally-2012-almost-over-bianco-134553880.html
QE is short for Quantitative Easing, which refers to various measures that central banks take to increase money supply in order to boost a weak eonomy.
When there's one QE after another and then another and it continues on, there are big risks which many experts and economists have been pointing out. One can't really tell from history what exactly is going to happen because it has never been done before.
Bernanke and his comrades in Federal Reserve are conducting big and risky experiments on the economy by crossing into completely uncharted territory. Judging from how complacent, unprepared and ignorant they were before the 2008 financial meltdown, I have serious doubts they're aware of the full consequences of what they're doing.