Oil prices are tumbling after comments from a Saudi royal family member cast more doubt on a deal for major global exporters to cap output. Saudi Arabia’s deputy crown prince, Mohammed bin Salman, said in an interview with Bloomberg that the kingdom will freeze its oil output only if Iran and other major producers agree to curb theirs. Analysts and brokers say this makes such a deal look much less likely, weakening one of the major sources of support for a rally that had pushed oil prices up 50% in about a month. The comments are the latest twist in deal-making efforts from Russia and the Organization of the Petroleum Exporting Countries that have been brewing for months, under much skepticism and hope from traders and analysts. Previous reports from OPEC officials had suggested the Saudis and their allies had become willing to participate in a deal to cap […]