RS - Trade and Drop Changes : Runescape News

You will be aware, from newsposts and this week's Development Diary, of real-world trading and the danger it poses to RuneScape. To solve this once and for all, we are tweaking what happens when you drop items, updating the trade system to warn you about unbalanced trades and planning a final adjustment to the trading system, in the first week of January.
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http://news.runescape.com/newsitem.ws?id=1007