The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical concepts
Why do Visa, Mastercard and so on advertise to consumers? As far as I know, the way in which bank payments are processed is immaterial to the account holder. In any case, you can’t choose – you get whichever one your bank decides.
Tom Gretton, Exeter
Send new questions to nq@theguardian.com.
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