There is some new content on the Beyond Cost Plus site that looks at the concepts of Price Discrimination and Differential Pricing.

The two have a lot in common, and the terms are frequently used interchangeably, but there are differences. Generally speaking price discrimination is the practice of charging different prices for the exact same, or at least very similar, product. A differential pricing strategy can include product differentiation which allows for a wider variety of product and pricing options.

It can be tricky so there are lots of examples and links to case studies that better illustrate the subtleties.