if by discrimination you mean guarantees versus best-efforts. business class services, speaking generally, are less or not at all over subscribed while providing contractual guarantees to service performance and problem resolution.

residential is best effort. they'll do their best to keep it up and give you the speeds you pay for, but if it doesn't work out that way sometimes, well, they're sorry about that.

Price discrimination is an economic concept - charging different prices for very similar products or services to get the value that each customer is willing to pay. That is often difficult and what normally happens is each customer is charged the same price.

Actually those are the rates for the best effort class of service. The business class service where you have guarantees is even more expensive.

That plus one or more of: SLAs, guaranteed minimum bandwidth, much higher upstream, better tech support, etc.

And static IPs, and a lack of language in the contract stating that servers cannot be hosted on it, and so on and so forth.