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If buying from a local shop or small business I always try to pay in cash, as it maybe more convenient to the customer to use contactless but the business owner has to pay merchant fees to Mastercard, Visa and Amex for the privilege of taking card payments. Which if you have just popped in and bought a can of pop and some crisps can be a big chunk of any profit the shop would make on the sale. Especially now they are legally no longer allowed to charge extra for card payments.