4. Results and discussion
4.1. Moderating effect test by interaction analysis By adopting the whole sample, we use Model 1 which contains the interaction item “ZECD∗ZTI” to test the moderating effect of technology intensity on the relationship between ECD and firm performance. The results are shown in Table 3. According to Table 3, ECD is positively related to firm performance (Beta = 0.234, T = 11.804), which means, on the whole, the positive effect of ECD still exceeds the negative effect of ECD at present in Chinese manufacturing firms. The standardized coefficient of TI is −0.035 (P = 0.020), which means firms with higher technology intensity have a relatively lower performance than firms with lower technology intensity in China. It is noteworthy that the standardized coefficient of the interaction item (ZECD∗ZTI) is −0.129 (P = 0.000), which means each percent positive change of technology intensity will lower 0.129% of the positive effect of ECD on firm performance. In another word, technology intensity can negatively moderate the relationship between ECD and firm performance. H1 holds.