Retailers: Tricks of the Trade

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We lift the curtain on the not-so-obvious techniques retailers use to get us to spend. Charles Spence, professor of experimental psychology at Oxford University, talks us through things like touch and taste, showing how packaging can have an effect on our decision to buy things. Web psychologist Nathalie Nahai shows us tricks used on internet shopping sites. And we speak to Matt Hogan, CEO and co-founder of Data Coup. He was fed up with companies buying data about their customers from third-party brokers, and set up a company which allows people to sell on their own data and make money out of it themselves, (Picture: Shoppers on Oxford Street, London; Credit: Justin Tallis/AFP/Getty Images)