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Many professional investors and traders use computer program trading to buy and sell orders for large blocks of stocks. The programs use mathematical models that are designed to give a trader the best possible price on shares.
The programs are often set up in advance and allow computers to react instantly to moves in the market. When a stock index drops by a big amount, for example, computers can unleash a torrent of sell orders across the market. They move so fast that prices, and in turn indexes, can plunge at the fast pace seen Thursday.
Many professional investors and traders use computer program trading to buy and sell orders for large blocks of stocks. The programs use mathematical models that are designed to give a trader the best possible price on shares.
The programs are often set up in advance and allow computers to react instantly to moves in the market. When a stock index drops by a big amount, for example, computers can unleash a torrent of sell orders across the market. They move so fast that prices, and in turn indexes, can plunge at the fast pace seen Thursday.
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