Economic expansion
Ease U.S. budget deficit
Lower interest rate
Quantitative Easing
Mortgage rates
Public buy off corporate debts
Lower burden of bond prices
Increase stock investment
Depreciation of the value of US dollars
Increase U.S. exports
Protect U.S. economy
Control high unemployment rate in U.S.
Increase inflation
Setup new rules leveling the playing field of global economy using US dollars before the next wave of storm in global economic crisis

Source: Black, P. J. (2010, November 5).  "QE2 Sets Sail."  Bank Investment Consultant [Web Blog Message].  Retrieved from http://www.bankinvestmentconsultant.com/blogs/qe2-federal-reserve-2669626-1.html