Commodity traders have a message for big raw material producers: modest cutbacks in production are not enough; they want to see blood. And they may get their wish because of pressure from the capital markets. After a rout that has more than halved the price of many major commodities over the past year, the financial pressure on some producers is becoming too much to bear, particularly those laden with tens of billions of dollars in debt accumulated during boom times. Swiss-based mining and trading giant Glencore PLC’s shares have fallen more than 35 percent in the past month, even as the price of key commodities it produces such as copper have begun to stabilize. U.S. oil and gas producer Samson Resources Corp filed for Chapter 11 protection two weeks ago, the largest but not likely the last big driller to fail or get bought. Alcoa this week split in […]