Previous empirical evidence indicates that the carbon market exerts a positive influence on the performance of corporate green innovation. In light of the proposition that there are differences in the green innovation capabilities of firms, we propose a masking effect hypothesis which suggests that the carbon market does, in fact, improve firms' green innovation performance at the overall level. However, separately, this improvement effect is only observed for high-capability firms, and not for ordinary firms. We test the hypothesis and explore the potential mechanism. The results show that, firstly, the outstanding green innovation performance of high-capability firms leads to a masking effect, which is robust to different estimation methods and variable settings. Secondly, the high innovation capability increases the positive effect of the carbon market on green innovation, irrespective of whether the capability is brown or green, which means a weak version of the masking effect. Finally, the different propensities towards co-innovation lead to the masking effect.
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