Special report: Goldman's new money machine: warehouses

``LME rules stipulate that warehouses must deliver a certain amount of metal each day. However the rules apply not to each warehouse but to each city that a company has warehouses in. At the moment, a warehouse operator needs to deliver just 1,500 tonnes a day per city, whether it owns one warehouse there or dozens. That means each of Metro's Detroit warehouses need to release only 79 tonnes of aluminum a day. At that rate, it would take two years to clear the stocks held by Goldman's Detroit warehouses.''