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The term is also used to mean automated trading system. These do indeed have the goal of making a profit. Also known as black box trading, these encompass trading strategies that are heavily reliant on complex mathematical formulas and high-speed computer programs. Such systems run strategies including market making, inter-market spreading, arbitrage, or pure speculation such as trend following. A third of all European Union and United States stock trades in 2006 were driven by automatic programs, or algorithms. Algorithmic trading and HFT have been the subject of much public debate since the U. In practice this means that all program trades are entered with the aid of a computer.