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Difference between the immediate sell price and immediate buy price.

You can sell an item instantly for X and can buy an item instantly for Y. You determine which items have the highest difference between X and Y. You buy for X and sell for Y.

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That's an arbitrage, then, if both sides are immediately available. Then it's just a question of how much profit can you lock-in.

yup but arbitrage is usually through other exchanges, or exploiting a triangle between assets. In runeescape there was downright no liquidity so it's more like day trading and using the liqudity gap as your margin.

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