Oil rose to an 18-month high on Monday after OPEC and some of its rivals reached their first deal since 2001 to jointly reduce output to tackle global oversupply, though prices slipped late in the day. On Saturday, producers from outside the Organization of the Petroleum Exporting Countries, led by Russia, agreed to reduce output by 558,000 barrels per day, short of the target of 600,000 bpd but still the largest non-OPEC contribution ever. That followed OPEC's Nov. 30 deal to cut output by 1.2 million bpd for six months from Jan. 1. Top exporter Saudi Arabia will cut around 486,000 bpd to reduce the supply glut that has dogged markets for two years. Crude futures have rallied sharply, with U.S. oil futures gaining 23 percent since the middle of November as optimism that an agreement would be reached started to grow. There is some concern amongst analysts that the big move in crude is not sustainable, and that the market may have overshot given the expectation that various producers would not comply with the cuts they agreed upon.

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