International use

The dollar is also used as the standard unit of currency in international markets for commodities such as gold and petroleum ( the latter sometimes called petrocurrency is the source of the term petrodollar). Some non-U.S. companies dealing in globalized markets, such as Airbus, list their prices in dollars.

The U.S. dollar is the world's foremost reserve currency. In addition to holdings by central banks and other institutions there are many private holdings which are believed to be mostly in $100 denominations. The majority of U.S. notes are actually held outside the United States. All holdings of US dollar bank deposits held by non-residents of the US are known as eurodollars (not to be confused with the euro) regardless of the location of the bank holding the deposit (which may be inside or outside the U.S.) Economist Paul Samuelson and others maintain that the overseas demand for dollars allows the United States to maintain persistent trade deficits without causing the value of the currency to depreciate and the flow of trade to readjust. Milton Friedman at his death believed this to be the case but, more recently, Paul Samuelson has said he now believes that at some stage in the future these pressures will precipitate a run against the U.S. dollar with serious global financial consequences.