iShares S&P MidCap 400 Value Index Fund Experiences Big Inflow
March 06, 2013 at 11:51 AM EST
Symbols mentioned in this story: IJJ, SLG, RE, RKT 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.