As the internet and profiling technologies become more common, many expect that buying histories will make a difference to the price you pay for goods and services.

BBC: Amazon's old customers 'pay more'

The episode spotlights the controversial subject of online profiling, whereby Internet ad server companies, such as DoubleClick and Engage, track Web surfers in order to strategically target banner ads and site content, as well as to help sites keep a running count of visitors.

CNN: U.S. antidrug site dealing cookies