Crude oil prices were down sharply again this week, reaching their lowest prices since January 2012.
Thursday, West Texas Intermediate (WTI) crude oil for November delivery dropped to $80.01 a barrel. That's a 23.4% dip from the three-year high it set in June. Brent oil prices were down 4.3% to $85.04 Tuesday. That was Brent's biggest one-day drop since September 2011.