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We head into the world of technology, have you ever wondered why an item is more expensive to you than it might be to others? Or why you might get a 10% off voucher just as you've forgotten to buy something you've left in a basket? It's all to do with shopping algorithms! How do they work? With the answer is Chris Green, an Independent Technology Analyst... If you've got a question for the Vicapedia, let us know! Email viconair@bbc.co.uk