MarketWatch | Oil futures lose 3% for the week on doubts over OPEC output deal MarketWatch WTI oil prices have climbed by about 15% since the Organization of the Petroleum Exporting Countries and 11 non-OPEC members agreed late last year to cut production starting from this month. The pact, if fully implemented, could wipe out about 1.8 ... Oil's month-long rally falters as output cut proof awaited US crude settles at $52.37, posts first weekly loss in five weeks on OPEC output cut concern Oil falls on China concerns, down 3 percent for the week on OPEC doubts |