http://www.scientificamerican.com/articl...
>For the past decade, e-commerce sites have altered prices based on your Web habits and personal attributes. An entire literature has emerged on the ethics, legality and economic promise of pricing optimization. And the field is advancing quickly: last September, Google received a patent on technology that lets a company dynamically price electronic content. For instance, it can push the base price of an e-book up if it determines you are more likely to buy that particular item than an average user; conversely, it can adjust the price down as an incentive if you are judged less likely to purchase. And you won't even know you are paying more than others for the exact same item.

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