What we're doing is putting together, in one margin calculation, both futures positions that are traded on New York Stock Exchange's futures exchange, NYSE Liffe US, and the fixed income securities positions that are currently cleared at DTCC FICC, the fixed income clearing corporation.

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Volume on NYSE Euronext's Liffe futures market rose nearly 50% in January, but fourth-quarter profit fell 75% on sluggish equity and derivatives business.

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Meanwhile nyse is pitching futures through Liffe, which it now owns.

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