When you go to a shopping mall, have you ever wondered why these pairs of items are placed next to each other; toothpaste and toothbrush, pens and writing pads, bread and jam, or apples and oranges? How about when shopping online? Have you ever thought of why you get recommendations based on what you just bought or added to a shopping cart, saying that Mr A who bought item A also bought item B? Do you think this is a mere coincidence? I DON'T THINK SO. Supermarkets keep sifting through the data they collect from their customers to find out the best ways to get the most money off their pockets...

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