Business investment is one of the major components of GDP. For example, a U.S. private-sector financial deficit from 2004 to 2008 transitioned to a large surplus of savings over investment that exceeded $1 trillion by early 2009, and remained above $800 billion into September 2012. Part of this investment reduction was related to the housing market, a major component of investment. This surplus explains how even significant government deficit spending would not increase interest rates (because businesses still have access to ample savings if they choose to borrow and invest it, so interest rates are not bid upward) and how Federal Reserve action to increase the money supply does not result in inflation (because the economy is awash with savings with no place to go).