Banks including Barclays and Wells Fargo are facing potentially heavy losses on an $850m loan made to two oil and gas companies, in a sign of how the dramatic slide in the price of oil is beginning to reverberate through the wider economy . Details of the loan emerged as delegates of Opec, the oil producers’ cartel, gathered in Vienna to address the growing glut in the supply of oil. More On this story On this topic IN Banks Several Opec members have been calling for a production cut to shore up prices, but Saudi Arabia, Opec’s leader and largest producer, signalled that while there was a consensus among the cartel’s Gulf members they would not clarify if that meant a push for a big change in the group’s output targets. Repercussions from the decline in the price of crude, which has dropped 30 per cent […]