[Dibby053]

So markets can only be (perfectly) efficient or competitive, not both at the same time. Largely theoretical but it tracks common sense!

[ffsm8]

The title on this HN submission is just wrong. Click on the link and find out.

[seizethecheese]

The title is wrong but you’re also wrong. Read the abstract of the paper. Here’s the relevant section:

> Combined with Maymin (2011), who proved that market efficiency requires P = NP, this yields a fundamental impossibility: markets can be informationally efficient or competitive, but not both.

[abejfehr]

isn't that what they're saying with "not both at the same time"? the papers both have opposite signs, one has != and the other has =

[ffsm8]

Without the braces around the perfectly I would have understood it... yeah, I think I was misinterpreting what he meant to say