Earlier quoted context omitted.
Fine, but blaming price increases on "greed" is still just as idiotic. Yes, market participants are "greedy" - sellers want to make the most money and buyers want to spend the least.
If only McDonalds charges $20 for a burger instead of $10, people will go elsewhere. If everyone charges $20 for a burger, people will still go to McDonalds. In such a state, no individual place would dare charge $10 again. Why cut revenue to nearly half? It’s not like they have the capacity to sell 20x the usual volume… I’m not convinced that basic economics works when output capacity isn’t fully scalable. Same reas…
This is what people seem to forget... you don’t need monopolies or collusion for markets to be uncompetitive. Collusion works fundamentally because participants aren't competing with each other... not for the fact people made a secret agreement. It is entirely possible for markets to be completely uncompetitive even without a monopoly or any collusion going on.
Your examples here are better known amongst economists as the Bertrand–Edgeworth model (https://en.wikipedia.org/wiki/Bertrand%E2%80%93Edgeworth_mod...)