PowerShares Water Resources Portfolio Experiences Big Inflow
July 29, 2015 at 10:49 AM EDT
Symbols mentioned in this story: PHO, PLL, PNR, HDS 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..