There is an investigation into online sales where different people get different prices for the same product, this does not include postage & packing, but more specifically the person as a target.
The RL comparison given was how a car salesman treats two different customers over the same car on their appearance! Apparently he will give a better discount to the guy with patent shoes, cuff links and a jacket straight out of Saville Row.
However, my view is different, perhaps why I am not a successful salesman. I would give the guy who dressed poorly the larger discount in the hope of selling two cars instead of one.
Does that make sense?