Kitco.com reported on Psychology of Copper:

Copper is often referred to as the metal with a Ph-D in macro-Economics, since it finds its way into so many industrial applications, including automobiles, appliances, airplanes, pipes, wires, and even computer chips, to mention just a few of its uses. As such, it acts as a top forecaster of where the global economy is heading next, especially China, Asia's economic locomotive. Copper is a favorite tool for speculators in the commodities markets, given its cyclical nature and volatility.

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