Oil investors are growing more doubtful that OPEC can seal a deal. Money managers reduced bets on higher oil prices by the most since July 2014 after the group failed to agree on country quotas in talks in Vienna late last month. The rally following the Organization of Petroleum Exporting Countriesā preliminary deal in late September has disappeared as questions mount about whether OPEC can implement the first supply cuts in eight years at its November 30 summit.

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