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Buy items at their lowest hour and sell at their peak hour.
Old School RuneScape is one global market, so many skilling supplies get cheaper at the hours when fewer players are online and dearer when more are. Time arbitrage means buying an item at its reliably cheap UTC hour and selling it at its reliably rich one, usually the same day. Every item on this page has had its buy hour and sell hour frozen in advance and scored against what the market actually did afterwards, and it is only listed while that record stays strong. Returns are shown after the 2% Grand Exchange tax.