Opec's problems aren't over yet! Here's a new one that the cartel is facing

Exporters' group has navigated both supply and demand crises

A global recession, both $140 and $30 oil, the US shale revolution, a market-share war, and output cuts. Opec’s 60-year history has rarely confronted a more challenging period than the past decade.

Now, instead of enjoying the higher prices resulting from 18 months of joint production cuts with a coalition of other major producers, the cartel faces new problems. A tweet-happy American president is ramping up geopolitical risk, renewed sanctions are hammering Iran’s exports, Venezuelan production is tanking as its economy collapses, and a political attack from Washington in the form of the NOpec bill.

The alliance of exporters, spearheaded by Saudi