Copper. When most people picture it, they imagine pennies, old pipes, wire spools sitting in a hardware store. Unglamorous. Industrial. Boring, even. But on Wall Street, copper has a nickname - Dr. Copper. It’s the metal with a PhD in economics. Why? Because copper is inside virtually everything - from buildings and vehicles to grid lines and consumer electronics - thus its price has historically told you something about the global economy. And that is – when copper prices rise, global demand is probably expanding. And when prices fall, a slowdown is coming. It’s a clean signal that’s been historically accurate. And ... (full story)