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   Dynamic Games of R&D Competition in a Differentiated Duopoly

Changying Li   Jianhu Zhang

Working paper

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(1) The stationary levels of R&D and quality for the open-loop strategies are socially optimal.

(2) The stationary feedback levels of R&D, quality, consumer surplus and social welfare are always lower than their open-loop counterparts; the opposite then is true with regard to firms¡¦ prices and profits.

(3)  Product differentiation does not impact the stationary levels of R&D and quality under the open-loop model, but it negatively affects the stationary levels of R&D and quality under the feedback model.

(4) R&D investment remains higher for a firm with an initial   quality advantage during the market evolution; however, the levels of R&D and product qualities of the two firms will ultimately converge to stationary points.