In 1920, the increasing price of copper forced a decrease in the penny's size from roughly that of today's quarter to its current familiar form. (canadianbusiness.com)
Average realized price of copper rose 16.5 percent to $ 3.11 per pound, Phoenix, Arizona - based Freeport said. (cnbc.com)
Plus, because the company's wires are made of metal, the prices it can sell them for are also tied to the market price of copper and aluminum, which have fallen steeply since 2011. (fortune.com)