A growing number of exchanges now use electronic systems to automate trades, and many use them exclusively. At exchanges that still use the "open outcry" system, the trading floor is noisy and chaotic. Every broker must be an auctioneer, yelling out his own price bids for purchases and sales. The highest bid wins and silences all the others. When a broker's primal scream is not heard, bids and offers can also be communicated with hand signals.
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