中文摘要：

城市创意阶层集聚是否有利于创新？针对这一问题，本文构建一个创意者居住选择模型，揭示了创意阶层集聚通过知识外部性推动城市创新的理论机制，并利用2007--2012年中国20个大城市面板数据进行实证检验。在基准估计中，通过控制人力资本、外商直接投资、对外贸易等知识外部性变量和其他环境变量，创意阶层集聚显著促进了城市创新。对城市和时期子样本的回归则显示，创意阶层集聚与城市创新间的因果关系具有稳健性。本文研究表明，营造良好环境以吸引创意阶层集聚，可以有效提升城市尤其是大城市的创新水平。

英文摘要：

Is creative class agglomeration in cities beneficial for innovation？ To answer the question, this paper builds a creative person living choice model, to expose the theoretical mechanism that creative class agglomeration promotes urban innovation through knowledge externalities, and then, uses panel data of Chinese 20 large cities during 2007--2012 to test the theoretical mechanism. In the basic estimation, after controlling knowledge externality variables such as human capital, foreign direct investment and for- eign trade and other environmental variables, creative class agglomeration significantly promotes urban in- novation. Based on city or period subsample, regressions show that the causal relationship between crea- tive class agglomeration and urban innovation is robust. Research of this paper indicates that creating a good environment to attract the agglomeration of creative class can effectively enhance large cities＇ innovation level.