With upcoming pressure from grain and meat prices, those categories, especially price, become increasingly important.

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Anne Tamar-Mattis of Advocates for Informed Choice, an American pressure group, says that though legal systems assume that male and female are indisputable categories, none defines them.

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Private-label pressure, from Tesco in vegetables and ASDA in tuna, has eaten into Heinz's profits in these categories, where consumers shop on price.

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