This weekend, 13 countries with little in common will attempt to act as one – by coming to an agreement to curb oil production and prop up prices. But the quarrelling members of the Organization of the Petroleum Exporting Countries, who meet Sunday in Doha, Qatar, have been acting less like a cartel and more like observers to a free market in crude oil. And the odds of the group reaching anything more than a fragile agreement to “freeze” output at current levels are slim. Given the nature of the 46-year-old cartel, it’s no wonder. Two of the group’s members – longtime foes Iran and Saudi Arabia – are backing warring […]