alt Hacker NewsTo say the purpose of a market is to reveal insider information is how you say insider trading is a good thing without saying insider trading is a good thing.
There's a ton of scholarly debate about it, and at least most of the early stuff was pretty earnest. But rather than the debate becoming more refined and nuanced over time it seems to have bifurcated along partisan (or partisan adjacent) lines like everything else, similar to the Keynesian/Misesian divide.
The proof that free markets are efficient (even in the narrow sense economists use this word) relies on an assumption of perfect information. This has been known at least since Akerlof.
The Misesian folks are a lost cause, IMHO. They're hardcore rationalists, self-indulging in circular moral arguments from assumptions that don't apply in the real world.