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Pair trading* is a technique to improve the productivity and quality of stock trading (or any type of financial trading, e.g. commodities). In pair trading, two traders share a single workstation. The trader at the keyboard (usually called the driver) actively trades, while the second trader (called the observer or navigator) is reviewing, advising, thinking through problems and generally sanity checking the first. These two roles switch on a regular basis (e.g. every 1/2 hour). The pairs also swap partners every day.
Pairing is one of the most valuable techniques you can bring your business, yet it is initially counter intuitive. It is hard to convince management that pairing will do anything but double your costs. In actual fact, most empirical studies show a significant increase in quality for a small (15-20%) cost overhead as compared to individuals working independently.