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Cross margin backs every position with your full account collateral, sharing PnL and margin - a winning position in your account can offset a losing position, and liquidation happens only when total equity falls below combined maintenance margin. Isolated margin allocates a fixed amount to one position: losses can’t exceed it, but profits elsewhere can’t rescue it. Cross is more capital-efficient; isolated is more contained. Arcus supports both. All positions are cross by default; isolated is enabled per market, before opening a position in it.