iShares Dow Jones U.S. Basic Materials Sector Index Fund Experiences Big Outflow
February 25, 2013 at 13:33 PM EST
Symbols mentioned in this story: IYM, PX, FCX, LYB Exchange traded funds (ETFs) trade just like stocks, but instead of ''shares'' investors are actually buying and selling ''units''. These ''units'' can be traded back and forth just like stocks, but can also be created or destroyed to accommodate investor demand.