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Will it signal the end of the commodity bull? Not a chance! Once the recession ends, as they all do, demand will surge again and we'll go through another round of escalating commodity prices. I expect this whole cycle to be exacerbated by central banks who will turn to the printing presses to "halt" the recession.
I wouldn't be surprised to see this whole cycle of inflation and deflation cycle two to three times before enough production is brought on line to end the commodity bull and start the next great bull market in stocks.