Oil futures fall for the first session in four, sliding below $80 a barrel as worries about demand and recent rallies in oil prices spelled diminished interest for energy contracts.

As U.S. regulators consider reining in excessive energy speculation, the two major U.S. futures exchanges square off over whether authorities should impose a blanket cap on positions traders hold on one exchange.

Oil-linked exchange-traded funds have been posting solid gains, but these specialized funds are complex and risky instruments that don't fully capture oil-price moves.

Protect your investments from the looming inflation of the U.S. dollar.

The growing popularity of exchange-traded funds is expanding beyond the U.S. stock market’s official hours, with investors in pre-market and after-hours sessions using the securities as a way to play broader-sector trends.

NOTE TO EDITORS: The Following Is an Investment Opinion Being Issued by AnalystChoice.com (AC).