Abstract
We investigate the relationship between market concentration and industry innovative effort within a familiar two-stage model of R&D race in which firms compete a la Cournot in the product market. With the help of numerical simulations, we show that such a setting is rich enough to generate Arrovian, Schumpeterian and inverted-U curves. We interpret these different patterns on the basis of the relative strength of the technological incentive and the strategic incentive.
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