On the basis of distinguishing whether firms participate in innovation and innovation performance,based on the micro-matching data of Chinese industrial firms and authorized patents from 1998 to 2013,the Heckman two-stage model is used to estimate the impact of two comp...MORE On the basis of distinguishing whether firms participate in innovation and innovation performance,based on the micro-matching data of Chinese industrial firms and authorized patents from 1998 to 2013,the Heckman two-stage model is used to estimate the impact of two competitive factors,firm size and market structure,on fi...