Cotation Assistée en Continu (CAC)

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The Cotation Assistée en Continu (CAC) was an electronic trading system used in the 1980s and 1990s by the French Stock Exchange called the Paris Bourse.


In 1986 the system was introduced and it went live in 1989. People also use CAC to refer to the CAC40, the most prominent French stock index, and the Compagnie des Agents de Change, a group of French brokers. The Toronto Stock Exchange used the CAC system to build its CATS system (Computer Assisted Trading System) in the 1990s. Euronext still uses the Nouveau Système de Cotation technology used in the CAC system today. The CAC system used a double-action algorithm to set prices and match orders.  


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