There are academic studies of pair programming. If I remember, it does obviously decrease software defects, but almost everyone that wants pair programming ignores the fact that you are now paying twice as much for the same software. The software is not 2x better. Obviously a programmer's salary is so minuscule to the business managers don't even factor this into their thinking. Usually they want pair programming for political reasons, i.e. no single person can ask for a raise due to being the most knowledgeable.
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