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Trading... stand or shop, that's not important.
The mechanism for a trade is.
My concept is pretty foolproof. You go to a shop, put the item up for "sale" by having the shopkeeper make a likeness of it (ancient photograph if you will) with a description of what the seller (you) expect in trade for it. The next time you visit the shop and talk to the shopkeeper, if anyone was interested, they would leave images of their items they would use in trade (gold could offered as an item as well). If you are online, you are immediately notified of the offer for your goods which you can either
1. reply in text as to why it wasn't satisfactory
2. reject the offer outright
3. accept the offer which IF BOTH PARTIES STILL HAVE THE GOODS LISTED, THE EXCHANGE IS IMMEDIATELY DONE.
I think that covers almost every situation, is clean, and not too difficult to implement.
Oh... the exchange page looks like two sets of slots, with the items for each party in each set, ready for exchange upon approval, and an area for a text message that might have standard expressions to accommodate the speed chat plus crowd.
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