作者已声明无竞争性利益关系。

The authors have declared that no competing interests exist.

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在无专利竞赛下，通过对不同市场结构下企业R& D动力的比较，本文认为竞争性市场结构有利于激励企业的技术创新。

The view that competitive market structure is most helpful to motivate R&D is verified by this paper by comparing different market structures without R&D rivalry.

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