BORROWING three words from Mario Draghi, the central banker who helped save the euro zone, Khalid al-Falih, Saudi Arabia's energy minister, and his Russian counterpart, Alexander Novak, on May 15th promised to do "whatever it takes" to curb the glut in the global oil markets. Ahead of a May 25th meeting of opec, the oil producers' cartel, they promised to extend cuts agreed last year by nine months, to March 2018, pushing oil prices up sharply, to around $50 a barrel. But to make the rally last, a more apt three-word phrase might be: "know thy enemy".
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