Oil prices have fallen to a near six-and-a-half-year low this morning.
West Texas Crude fell to US$40.59, the lowest level since March 2009 when it touched $39.44.
It is falling because of too much supply and weak demand.
Crude oil prices have fallen by 50 percent in a year.
Prices at the pumps in New Zealand are also falling, but not by anywhere near as much as crude oil. So what's going on?
Watch the video for the full chat with Tony Field.