The royalty of the global oil world descends on this Persian Gulf outpost this weekend to discuss freezing its collective output, a gambit to end a nearly two-year price rout. A deal is far from certain. Even if there is an agreement, the impact on markets next week and the ramifications for the global economy further out are likely to come down to a careful parsing of how any deal is communicated. Key participants including Russia and Saudi Arabia, the world’s two biggest producers, have said little about what they are going to discuss, how they will define and enforce a freeze and who would be bound by the deal. One of the biggest unknowns: Will Riyadh insist that Iran, just emerging from restrictions on its global oil sales, be asked to join […]