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The productivity of a researcher is the product of the researchers ability in each subtask: P = F1 * F2 * F3 ... If one exceeds someone else in each factor by 50% than the resulting productivity is 25 fold. According to that model and the overall productivity of researchers is log-normal if the various subtasks have normal distribution. (from Shockley: On the Statistics of Productivity in Research; Procedings of the IRE, March 1957)