Seems like you’d get exactly this situation in any of the games that use the big-global-auction-house method of trading, no? Are they (in your view) inherently unhealthy?
Genuinely curious here, because clearly you know way more about economics in general and game-world economics in particular than I do. Can you give us some examples of games with imperfect vs [more] perfect marketplaces? Or, what are some games that you think have healthy economies, and how do they maintain that health?
…Aaaand that sounds like I’m asking you to write a full-on dissertation, which I don’t mean to do. If you have any good starting points for reading material or whatnot I can go read up on it myself.
More on topic: what makes an in-game bulletin board significantly different from forum threads like yours and the “Active Shops” one?
[EDIT: Think I’m conflating @Lawrey’s “bulletin board” with “signs” – I take back this question, I’m good. I was imagining something more like those physical bulletin board thingies you see on uni campuses and coffee shops – giant publicly-writeable sign-houses. I’d like an order of that, please.]
I’d imagine (perhaps naively) that the largest barrier to a new trader in the present system is getting their name out, especially amidst all the defunct market stalls. So based on that, I’d expect a bulletin board system to help newcomers – because, speaking as a frequent purchaser of all kinds of stuff, I very rarely have the patience to go browse all of Therka Market on the chance there’s something new, but I’ll stop by @AlexanduhHi’s place in New Berlyn because I know it’s there.