Copper prices are tanking 3.5% today as oil rallies and fears over a potential economic slow-down from surging oil prices worry investors. This divergence is notable due to the fact that copper and oil prices had largely moved in tandem up until just recently. As fears in the Middle East developed a clear divergence appeared. Over the last month the divergence has resulted in a nearly 25% swing. If you’re looking for a real-time sign of economic concern this is your metric….