[Auction house types; discuss]

I'm going to have to reiterate atrophil on this.. There is a bunch of information within phils link about markets and buy/sell orders, good read i would suggest it

 

But from what i read, yes i think there is going to be buy/sell orders.

I somehow missed the link thanks.  It sounds like a good starting place.  

[Player Controled NPCs]

An interesting idea came to me when I was considering how trading would take place and I was wondering if it would possible for player scripted NPCs would be possible.  the Initial idea was as storefronts for player made items but you could expand that in some interesting ways such as quest givers or even lore NPCs to populate your structures.

[Auction house types; discuss]

one thing I would like to see is that whatever system used it has the ability to place buy orders.