It does? There's quite a few counterexamples to that, such as airline fares, cars, etc.

The example above is Facebook charging a single person $1k/year while not charging other people. That's called price discrimination: https://econsultancy.com/what-is-price-discrimination-and-is...

It would be a slam dunk lawsuit.

You can still offer discounts (airline tickets, Adobe, etc.) or negotiate pricing (cars, etc.) legally.

But, it is illegal to isolate someone and charge them more without justification as in OC's example.

So yes, Facebook charging a single person $1k/year is a true hypothetical. It couldn't happen legally in the US.

Different customers get different discounts on all sorts of goods and services, reflecting the various importance of the customer, difficulty of dealing with them, etc. We get an x% discount off list on Cisco network kit, I assume that others get y% or z%.

Yes, but it matters who gets those discounts. If you took a prior action to earn the discount no problem. If it's assigned randomly, no problem.

If Costco charges $1k for a bagel and gives it away to everyone for free except insists on you paying, that's a problem. You're not allowed to isolate discounts based on race, gender, etc. So Costco would have to have a pretty creative reason for making you pay and no one else. It wouldn't hold up in court and it would be price discrimination.

Can you show evidence of this? What about airline tickets?

No it doesn't.

Yes, it's called price discrimination: https://econsultancy.com/what-is-price-discrimination-and-is...

Then Adobe has a huge legal problem.