Guardian: The last decade saw the end of cheap oil, the magic growth ingredient for the global economy after the second world war. This summer’s increase in maize, wheat and soya bean prices – the third spike in the past five years – suggests the era of cheap food is also over.
Price increases in both oil and food provide textbook examples of market forces. Rapid expansion in the big emerging markets, especially China, has led to an increase in demand at a time when there have been supply constraints. For…

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