Abstract
The natural gas futures market is fundamental to the current natural gas market both as means of price discovery and for price hedging. Thus, the informational efficiency of the futures market is an important issue. In this article we re-examine the informational efficiency of the natural gas futures market. In this re-examination several cash price series are considered. It is found that the natural gas futures market is informationally efficient for only one of the cash markets. The characteristics of the current natural gas market that might explain the estimated results are also discussed.