If you are looking for bargains online, then who you are can have a big affect on what you pay. Companies use personal data to charge different people different prices for the very same product. If you have ever noticed that advertisements change once you search for something, then you are seeing this at work. Companies see what you like and then they charge you more for it. The more info they have on you, then the more they can raise prices.
Read more: Looking for bargains online? Who you are can affect what you pay