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innovation in a socially desirable substitute. Evolutionary theory emphasizes the possibility of innovation waves associated with … products. It does appear, however, that dominant designs did have substantial positive innovation effects. More specifically … innovation effects at the firm level than among individual inventors"--National Bureau of Economic Research web site …
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We describe an algorithmic approach to determine an efficient railway rolling stock circulation on a single line or on a set of interacting lines. Given the timetable and the passengers? seat demand, we develop a branch-and-price algorithm that results in an allocation of rolling stock material...
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