结果表明，纯知识溢出存在时滞性。
The result indicates that there is spillover lags in pure knowledge spillovers.
本文在企业层面上研究技术的租金溢出与纯知识溢出，刻画了这两种不同类型溢出之间的本质区别。
The present paper studies rent - spillovers and pure knowledge spillovers for a single firm and characterizes the essential difference between two kinds of spillover.
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