After the huge rise and fall of agricultural commodity spot and futures prices between 2007 and 2008, the potential reasons for and the impact of the strong rise in volatility provoked an intensive debate in the media as well as in the academic literature. However, owing to the increasing...

This paper analyzes the relationship between the spot and futures prices of energy commodities from a new perspective. Taking data from the Dow Jones UBS Commodity Index, we first test for a long-run relationship between spot and futures prices. As a second step, smooth transition models are...