Goldman Sachs did that with aluminum. https://www.nytimes.com/2013/07/21/business/a-shuffle-of-aluminum-but-to-banks-pure-gold.html https://www.nytimes.com/201

Goldman Sachs did that with aluminum. https://www.nytimes.com/2013/07/21/business/a-shuffle-of-aluminum-but-to-banks-pure-gold.html https://www.nytimes.com/2013/07/21/business/a-shuffle-of-alu...