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Sainsbury's, one of the UK's largest supermarket chains, has just started to sell an organic fair-trade extra-virgin olive oil produced by farmers in Palestine. The supermarket said it was expected to be an important product for ethical consumers, who were keener than ever to know the provenance of their food and to ensure producers were receiving a decent wage. The oil retails at 8.50 [pounds sterling] for a 500 ml bottle. The farmers producing...