This is simple and very useful.
The point is that when u opend an item that u own on market u have a update button that will lower -1 tc from your opponents item.. of there is the mannualy price change thing like it is now.
I see this like the remove button from the items that you already have for your items that are on market.
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This would make life eaayer for evwrybody that wants to sell something.
I can draw ascetch later.