Nothing on the scale of stock markets and clans...
What I would love is a new sort order in the market according to how many I own of an item. (I hope it is clear. Pizza Crusts would be at the top and Essences of Pigeon at the bottom.)
Another, related, feature: when I click on an item, besides the description and the prices it could also show how many of the item I have.
Great idea. I also wish that I could sort my own inventory in some way. Either I am missing that, I dunno, but having all of my other items in no (apparently) sensible order is confusing me incredibly.
I mean, I may be huge and all, but my thinking power is fairly limited.
Your inventory is sorted by price in each group, which roughly corresponds to level as well. I was going to add a "current quantity" bit to the item descriptions, but having it as a sort order would be useful too. Customizable inventory sorting is on the way...