Pourquoi la cotation des données du marché est-elle retardée ?

Market data is usually provided in two categories: real-time and delayed. Real-time market data is displayed as soon as the information is publicly available, while delayed market data is shown with a time lag, usually 15 minutes behind real-time quotes.
Some exchanges allow delayed data to be displayed free of charge and without an active market data subscription. Where available, clients may receive free delayed market data for products for which they do not currently hold a real-time market data subscription.
Not subscribing to real-time market data does not prevent order execution. However, clients must have the required trading permissions for the products they wish to trade. Clients should also be aware that, when using delayed data, the prices shown may not reflect the current live market.
Please note that delayed quotes are not provided for U.S. stocks on live accounts held with IB LLC or owned by U.S. residents, due to FINRA regulations.

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