Wall Street JournalBig Oil's Bet on Natural Gas Is a Slow BurnWall Street JournalYet big oil has little choice but to double down on gas. Companies have discovered fewer large new oil depositsthan natural gas opportunities over the past decade. Governm …

Wall Street JournalWhat Is 'Tracking Error' in Oil Funds?Wall Street JournalFund investors wanting to bet on a rebound in the oil market need to watch out for something called “tracking error.” The issue is simple: Do the price changes in the fund …