Making sense of the chaos in commodity markets

THE WORLD championships of slot-car racing are a microcosm of mayhem. Tiny remote-controlled models of cars fly up, down and off a convoluted circuit faster than befuddled spectators can follow. Forecasting winners is impossible. This year’s race, due to be held in America, was cancelled owing to travel restrictions. But amateurs of high-risk betting might instead find consolation in the equally bewildering, rapidly changing world of commodities.