why do shops like tesco promote memberships (like clubcard) that produce prices? wouldn’t they just lose money?
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Your data is worth much more than the saving you get.
The Tesco’s card adds up to about a 1% discount, so not much from their PoV, but in return they know almost everything about you. Your age, address, mobile number, email, gender, household size, ice cream preference, etc. etc.
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