Investment banks tighten stranglehold on metals

``Goldman's warehouse on the banks of the Detroit River is one of more than 100 storage facilities controlled by the giant securities firm around the world. The warehouses are part of Wall Street's effort to forge a new frontier in the commodities markets: warehousing metal... In Detroit, Goldman often offers a discount to attract customers to its warehouses but sometimes forces buyers to wait seven months or longer to get their inventory back, according to some users and LME data... As a result of recent complaints, the LME will require most warehouses to release more metal on a daily basis starting next April. But analysts say the exchange's move isn't enough to alleviate the delays.''