Although some time-tested principles remain constant, investing is an evolving set of methodologies, due to various factors, including new styles institutions adopt. For example, liquidity has greatly improved in recent years due to prevelance of high-frequency trading, which provides willing buyers and sellers at more price points, often at penny spreads. A team of programmers at SourcePulse, a Texas-based software firm, worked with Easan Katir to improve screening, trading and risk control algorithms.

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