Trade limit - The RuneScape Wiki

The Trade limit is a mechanism in the trading system that prevented players from making trades considered to be too "unbalanced", that is, where one of the two players involved in the trade gave much more than they received according to the item's value in the Grand Exchange. This limit only affects new accounts that have never subscribed to a RuneScape membership in the past, and is limited to a 25k limit disparity between trade and Grand Exchange values. Jagex originally introduced it as part of measures to curb real world trading. As a side benefit, the trade limit also discouraged and mostly eliminated "hacking" other players' accounts. The Trade Limit now only affects accounts that have never subscribed before.

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All rares/weapons that were previously above max cash were traded on the GE within 24 hours of the max cash update : r/runescape

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Runescape] How to beat the trade limit! [table version] [2013]