This article also touches on hoarding copper, oil, etc. Nothing of genuine value is produced by this bizarre process. It's just wasting energy to take, not make, profits. Private sector efficiency atcha!

NYT: A Shuffle of Aluminum, but to Banks, Pure Gold
MOUNT CLEMENS, Mich. — Hundreds of millions of times a day, thirsty Americans open a can of soda, beer or juice. And every time they do it, they pay a fraction of a penny more because of a shrewd maneuver by Goldman Sachs and other financial players that ultimately costs consumers billions of dollars.

The story of how this works begins in 27 industrial warehouses in the Detroit area where a Goldman subsidiary stores customers’ aluminum. Each day, a fleet of trucks shuffles 1,500-pound bars of the metal among the warehouses. Two or three times a day, sometimes more, the drivers make the same circuits. They load in one warehouse. They unload in another. And then they do it again.

...

Metro International holds nearly 1.5 million tons of aluminum in its Detroit [Metro] facilities, but industry rules require that all that metal cannot simply sit in a warehouse forever. At least 3,000 tons of that metal must be moved out each day. But nearly all of the metal that Metro moves is not delivered to customers, according to the interviews. Instead, it is shuttled from one warehouse to another.

Because Metro International charges rent each day for the stored metal, the long queues caused by shifting aluminum among its facilities means larger profits for Goldman. And because storage cost is a major component of the “premium” added to the price of all aluminum sold on the spot market, the delays mean higher prices for nearly everyone, even though most of the metal never passes through one of Goldman’s warehouses.

...

Nick Madden, chief procurement officer for one of the nation’s largest aluminum purchasers, Novelis, said the situation illustrated the perils of allowing industries to regulate themselves.”...