Tesco, Sainsbury's Make Millions Off Loyalty Card Data: Times - Bloomberg

Tesco Plc and J Sainsbury’s Plc, two of the biggest UK supermarkets, make about £300 million ($376 million) a year from selling information about their customers’ shopping preferences, the Times reported.

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Tesco, Sainsbury's Make Millions Off Loyalty Card Data: Times

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How Tesco and Sainsbury's made £300m out of your loyalty cards