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The innovation efficiency of each link of China's non-ferrous metal-new energy industrial chain was measured based on a four-stage DEA model, and its influencing factors were analyzed with the Tobit model. Based on the study, the following conclusions can be made: after SFA model adjustment, the four links of the industrial chain, i.e. mineral products, refined products, new energy materials and new energy application, can be arranged in descending order in terms of innovation efficiency, and pure technical efficiency is the key factor restricting the improvement of the innovation efficiency of each link of the industrial chain; the innovation efficiency of the industrial chain also presents the characteristics of being stronger in the west and weaker in the east in terms of spatial distribution; state-owned enterprises can demonstrate high innovation efficiency than non-state-owned enterprises; the concentration of suppliers, enterprise size, and the quality of employees are positively correlated to the innovation efficiency, while the degree of market competition, the debt to asset ratio, and the equity concentration are negatively correlated to the innovation efficiency. In order to improve the innovation efficiency of the industrial chain, more efforts should be made in policy support for reducing innovation risks of new energy enterprises, increasing the returns of new energy enterprises, and promoting the formation of industrial clusters.
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基于四阶段DEA模型,测算了我国有色金属-新能源产业链各环节创新效率,并结合Tobit模型检验其影响因素。结果表明:经SFA模型调整,产业链创新效率呈现矿产品>精炼产品>新能源材料>新能源应用的特征,纯技术效率是制约产业链各环节创新效率提升的关键因素;空间上产业链创新效率呈现“西强东弱”的分布特征,产权上国企高于非国企;供应商集中度、企业规模、员工质量与创新效率正相关,市场竞争程度、资产负债率、股权集中度与创新效率负相关。为提升产业链创新效率,应从降低新能源企业创新风险、提高新能源企业收益、推动产业集聚等方面加大政策支持力度。
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1.Research Institute of Energy Metal Industry, Gannan University of Science and Technology, Ganzhou 341000, Jiangxi, China
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1.赣南科技学院 能源金属产业研究院,江西 赣州 341000
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方文龙(1995—),男,江西崇仁人,博士研究生,主要从事资源经济与管理研究。E-mail:2360999278@qq.com
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方文龙(1995—),男,江西崇仁人,博士研究生,主要从事资源经济与管理研究。E-mail:2360999278@qq.com
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3.中国科学院 赣江创新研究院,江西 赣州 341000)])], figs=[ArticleFig(id=1240651357745632118, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Fig.1, caption=
Innovation efficiency of each link industrial chain before adjustment, figureFileSmall=yMJFFoU1IBlO0FYxsXFWcg==, figureFileBig=2vjHNwBYlPlllpBvuGVMPw==, tableContent=null), ArticleFig(id=1240651357854684035, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=图1, caption=
产业链各环节调整前创新效率值, figureFileSmall=yMJFFoU1IBlO0FYxsXFWcg==, figureFileBig=2vjHNwBYlPlllpBvuGVMPw==, tableContent=null), ArticleFig(id=1240651357963735950, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Fig.2, caption=
Innovation efficiency of each link in industrial chain after adjustment, figureFileSmall=g3ujnYCYLTgAFEQjHG41uw==, figureFileBig=zrpjzr6lwddgV1c+v9fsHQ==, tableContent=null), ArticleFig(id=1240651358039233432, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=图2, caption=
产业链各环节调整后创新效率值, figureFileSmall=g3ujnYCYLTgAFEQjHG41uw==, figureFileBig=zrpjzr6lwddgV1c+v9fsHQ==, tableContent=null), ArticleFig(id=1240651358131508129, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Table 1, caption=
Pearson correlation coefficient of input-output index
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | Inp1 | Inp2 | Inp3 | Inp4 |
|---|
| Outp1 | 0.894*** | 0.998*** | 0.839*** | 0.697*** |
| Outp2 | 0.406*** | 0.285*** | 0.429*** | 0.309*** |
), ArticleFig(id=1240651358248948652, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=表1, caption=
投入产出指标的Pearson相关系数
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | Inp1 | Inp2 | Inp3 | Inp4 |
|---|
| Outp1 | 0.894*** | 0.998*** | 0.839*** | 0.697*** |
| Outp2 | 0.406*** | 0.285*** | 0.429*** | 0.309*** |
), ArticleFig(id=1240651358416720823, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Table 2, caption=
Definition of variables
, figureFileSmall=null, figureFileBig=null, tableContent=
| 维度 | 要素 | 变量符号 | 单位 |
|---|
| 投入变量 | 固定资产+在建工程 | Inp1 | 亿元 |
| 企业营业成本 | Inp2 | 亿元 |
| 企业研发人员数量 | Inp3 | 人 |
| 企业研发投入资金总额 | Inp4 | 亿元 |
| 产出变量 | 专利授权数量 | Outp1 | 项 |
| 企业期末净利润 | Outp2 | 亿元 |
| 环境变量 | 区域人均GDP | Inv1 | — |
| 政府补助 | Inv2 | 亿元 |
| 行业类型 | Inv3 | — |
| 上市年限 | Inv4 | — |
| 产权性质(国企取1,非国企取0) | Inv5 | — |
| 企业规模(年末总资产) | Inv6 | 亿元 |
), ArticleFig(id=1240651358571910086, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=表2, caption=
变量定义
, figureFileSmall=null, figureFileBig=null, tableContent=
| 维度 | 要素 | 变量符号 | 单位 |
|---|
| 投入变量 | 固定资产+在建工程 | Inp1 | 亿元 |
| 企业营业成本 | Inp2 | 亿元 |
| 企业研发人员数量 | Inp3 | 人 |
| 企业研发投入资金总额 | Inp4 | 亿元 |
| 产出变量 | 专利授权数量 | Outp1 | 项 |
| 企业期末净利润 | Outp2 | 亿元 |
| 环境变量 | 区域人均GDP | Inv1 | — |
| 政府补助 | Inv2 | 亿元 |
| 行业类型 | Inv3 | — |
| 上市年限 | Inv4 | — |
| 产权性质(国企取1,非国企取0) | Inv5 | — |
| 企业规模(年末总资产) | Inv6 | 亿元 |
), ArticleFig(id=1240651358731293650, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Table 3, caption=
Number of enterprises in different links of industrial chain
, figureFileSmall=null, figureFileBig=null, tableContent=
| 产业链环节 | 企业数量 | 国企数量 |
|---|
| 东部 | 中部 | 西部 | 合计 |
|---|
| 矿产品 | 2 | 0 | 0 | 2 | 0 |
| 精炼产品 | 12 | 5 | 3 | 20 | 6 |
| 新能源材料 | 7 | 2 | 1 | 10 | 1 |
| 新能源应用 | 33 | 6 | 6 | 45 | 8 |
), ArticleFig(id=1240651358831956957, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=表3, caption=
产业链不同环节企业数量
, figureFileSmall=null, figureFileBig=null, tableContent=
| 产业链环节 | 企业数量 | 国企数量 |
|---|
| 东部 | 中部 | 西部 | 合计 |
|---|
| 矿产品 | 2 | 0 | 0 | 2 | 0 |
| 精炼产品 | 12 | 5 | 3 | 20 | 6 |
| 新能源材料 | 7 | 2 | 1 | 10 | 1 |
| 新能源应用 | 33 | 6 | 6 | 45 | 8 |
), ArticleFig(id=1240651358936814568, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Table 4, caption=
Measurement results of innovation efficiency of different links of industrial chain before adjustment from 2017 to 2022
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类型 | 产业链环节 | 调整前均值 | 均值 |
|---|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 |
|---|
| 创新效率 | 矿产品 | 0.815 | 0.886 | 0.900 | 0.811 | 0.847 | 0.737 | 0.832 |
| 精炼产品 | 0.852 | 0.849 | 0.878 | 0.849 | 0.856 | 0.886 | 0.862 |
| 新能源材料 | 0.794 | 0.742 | 0.809 | 0.811 | 0.832 | 0.951 | 0.823 |
| 新能源应用 | 0.821 | 0.798 | 0.808 | 0.806 | 0.864 | 0.862 | 0.827 |
| 整体均值 | | | | 0.836 | | | |
| 纯技术效率 | 矿产品 | 0.837 | 0.904 | 0.906 | 0.812 | 0.850 | 0.750 | 0.843 |
| 精炼产品 | 0.887 | 0.862 | 0.908 | 0.887 | 0.882 | 0.925 | 0.892 |
| 新能源材料 | 0.805 | 0.846 | 0.862 | 0.859 | 0.894 | 1.000 | 0.877 |
| 新能源应用 | 0.830 | 0.821 | 0.841 | 0.857 | 0.896 | 0.935 | 0.863 |
| 规模效率 | 矿产品 | 0.967 | 0.977 | 0.993 | 1.000 | 0.997 | 0.976 | 0.985 |
| 精炼产品 | 0.964 | 0.987 | 0.967 | 0.958 | 0.971 | 0.959 | 0.968 |
| 新能源材料 | 0.987 | 0.896 | 0.946 | 0.946 | 0.937 | 0.951 | 0.944 |
| 新能源应用 | 0.989 | 0.974 | 0.962 | 0.938 | 0.964 | 0.923 | 0.958 |
), ArticleFig(id=1240651359071032300, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=表4, caption=
2017—2022年产业链不同环节调整前创新效率测度结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类型 | 产业链环节 | 调整前均值 | 均值 |
|---|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 |
|---|
| 创新效率 | 矿产品 | 0.815 | 0.886 | 0.900 | 0.811 | 0.847 | 0.737 | 0.832 |
| 精炼产品 | 0.852 | 0.849 | 0.878 | 0.849 | 0.856 | 0.886 | 0.862 |
| 新能源材料 | 0.794 | 0.742 | 0.809 | 0.811 | 0.832 | 0.951 | 0.823 |
| 新能源应用 | 0.821 | 0.798 | 0.808 | 0.806 | 0.864 | 0.862 | 0.827 |
| 整体均值 | | | | 0.836 | | | |
| 纯技术效率 | 矿产品 | 0.837 | 0.904 | 0.906 | 0.812 | 0.850 | 0.750 | 0.843 |
| 精炼产品 | 0.887 | 0.862 | 0.908 | 0.887 | 0.882 | 0.925 | 0.892 |
| 新能源材料 | 0.805 | 0.846 | 0.862 | 0.859 | 0.894 | 1.000 | 0.877 |
| 新能源应用 | 0.830 | 0.821 | 0.841 | 0.857 | 0.896 | 0.935 | 0.863 |
| 规模效率 | 矿产品 | 0.967 | 0.977 | 0.993 | 1.000 | 0.997 | 0.976 | 0.985 |
| 精炼产品 | 0.964 | 0.987 | 0.967 | 0.958 | 0.971 | 0.959 | 0.968 |
| 新能源材料 | 0.987 | 0.896 | 0.946 | 0.946 | 0.937 | 0.951 | 0.944 |
| 新能源应用 | 0.989 | 0.974 | 0.962 | 0.938 | 0.964 | 0.923 | 0.958 |
), ArticleFig(id=1240651359192667125, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Table 5, caption=
Measurement results of innovation efficiency of enterprises with different property rights in different regions from 2017 to 2022
, figureFileSmall=null, figureFileBig=null, tableContent=
| SFA调整前后 | 效率 | 产权性质 | 区域 |
|---|
| 中央国企 | 地方国企 | 民营企业 | 外企 | 东部 | 中部 | 西部 |
|---|
| 调整前 | 创新效率 | 0.915 | 0.906 | 0.816 | 0.850 | 0.840 | 0.791 | 0.870 |
| 纯技术效率 | 0.925 | 0.942 | 0.853 | 0.888 | 0.879 | 0.822 | 0.888 |
| 规模效率 | 0.989 | 0.961 | 0.958 | 0.956 | 0.957 | 0.962 | 0.981 |
| 调整后 | 创新效率 | 0.963 | 0.902 | 0.907 | 0.850 | 0.903 | 0.901 | 0.949 |
| 纯技术效率 | 0.973 | 0.925 | 0.938 | 0.870 | 0.934 | 0.923 | 0.964 |
| 规模效率 | 0.989 | 0.975 | 0.965 | 0.975 | 0.964 | 0.975 | 0.985 |
), ArticleFig(id=1240651359284941818, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=表5, caption=
2017—2022年不同产权性质、不同区域企业创新效率测度结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| SFA调整前后 | 效率 | 产权性质 | 区域 |
|---|
| 中央国企 | 地方国企 | 民营企业 | 外企 | 东部 | 中部 | 西部 |
|---|
| 调整前 | 创新效率 | 0.915 | 0.906 | 0.816 | 0.850 | 0.840 | 0.791 | 0.870 |
| 纯技术效率 | 0.925 | 0.942 | 0.853 | 0.888 | 0.879 | 0.822 | 0.888 |
| 规模效率 | 0.989 | 0.961 | 0.958 | 0.956 | 0.957 | 0.962 | 0.981 |
| 调整后 | 创新效率 | 0.963 | 0.902 | 0.907 | 0.850 | 0.903 | 0.901 | 0.949 |
| 纯技术效率 | 0.973 | 0.925 | 0.938 | 0.870 | 0.934 | 0.923 | 0.964 |
| 规模效率 | 0.989 | 0.975 | 0.965 | 0.975 | 0.964 | 0.975 | 0.985 |
), ArticleFig(id=1240651359398187016, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Table 6, caption=
SFA model estimation results of the second stage
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | 固定资产冗余 | 营业成本冗余 | 研发经费冗余 | 研发人员冗余 |
|---|
| C | -14.44*(-1.73) | -1 969.89***(-47.58) | -11.07***(-11.10) | -8.94***(-8.77) |
| Inv1 | 0.99*(1.86) | 55.45*(1.84) | 0.84*(1.91) | -5.25***(-3.06) |
| Inv2 | 1.40***(6.02) | 232.08***(3.45) | -0.03***(-3.03) | 44.61***(6.35) |
| Inv3 | 0.04(0.48) | 14.22(0.53) | -0.07***(-4.23) | 1.76(0.68) |
| Inv4 | 0.58**(2.34) | 332.27**(2.01) | 0.12***(3.56) | 17.64***(8.57) |
| Inv5 | -0.48(-0.55) | -164.13*(-1.70) | 0.42***(3.86) | -2.56**(-2.45) |
| Inv6 | 0.000 8***(-4.51) | -1.99***(-6.52) | 0.000 6***(0.39) | -0.10***(-2.85) |
| δ2 | 31.81***(6.39) | 4 816 495***(4 793 884.4) | 29.71***(29.71) | 45 459.08***(45 376.08) |
| γ | 0.93***(4.54) | 0.95***(25.73) | 0.92**(2.51) | 0.99***(2.91) |
| LR | 62.68*** | 38.17*** | 40.36*** | 50.57*** |
), ArticleFig(id=1240651359528210448, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=表6, caption=
第二阶段SFA模型估计结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | 固定资产冗余 | 营业成本冗余 | 研发经费冗余 | 研发人员冗余 |
|---|
| C | -14.44*(-1.73) | -1 969.89***(-47.58) | -11.07***(-11.10) | -8.94***(-8.77) |
| Inv1 | 0.99*(1.86) | 55.45*(1.84) | 0.84*(1.91) | -5.25***(-3.06) |
| Inv2 | 1.40***(6.02) | 232.08***(3.45) | -0.03***(-3.03) | 44.61***(6.35) |
| Inv3 | 0.04(0.48) | 14.22(0.53) | -0.07***(-4.23) | 1.76(0.68) |
| Inv4 | 0.58**(2.34) | 332.27**(2.01) | 0.12***(3.56) | 17.64***(8.57) |
| Inv5 | -0.48(-0.55) | -164.13*(-1.70) | 0.42***(3.86) | -2.56**(-2.45) |
| Inv6 | 0.000 8***(-4.51) | -1.99***(-6.52) | 0.000 6***(0.39) | -0.10***(-2.85) |
| δ2 | 31.81***(6.39) | 4 816 495***(4 793 884.4) | 29.71***(29.71) | 45 459.08***(45 376.08) |
| γ | 0.93***(4.54) | 0.95***(25.73) | 0.92**(2.51) | 0.99***(2.91) |
| LR | 62.68*** | 38.17*** | 40.36*** | 50.57*** |
), ArticleFig(id=1240651359641456669, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Table 7, caption=
Innovation efficiency measurement results of different links of industrial chain after adjustment from 2017 to 2022
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类型 | 产业链环节 | 调整后均值 | 均值 |
|---|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 |
|---|
| 创新效率 | 矿产品 | 0.978 | 0.968 | 0.971 | 0.986 | 0.969 | 0.969 | 0.973 |
| 精炼产品 | 0.938 | 0.935 | 0.927 | 0.922 | 0.935 | 0.953 | 0.935 |
| 新能源材料 | 0.773 | 0.783 | 0.966 | 0.975 | 0.964 | 0.966 | 0.904 |
| 新能源应用 | 0.902 | 0.893 | 0.891 | 0.888 | 0.888 | 0.916 | 0.896 |
| 整体均值 | | | | 0.927 | | | |
| 纯技术效率 | 矿产品 | 0.991 | 0.994 | 0.998 | 0.996 | 0.986 | 0.983 | 0.991 |
| 精炼产品 | 0.957 | 0.955 | 0.945 | 0.947 | 0.949 | 0.981 | 0.956 |
| 新能源材料 | 0.783 | 0.969 | 0.974 | 0.982 | 0.965 | 1.000 | 0.945 |
| 新能源应用 | 0.935 | 0.925 | 0.918 | 0.917 | 0.918 | 0.944 | 0.926 |
| 规模效率 | 矿产品 | 0.987 | 0.974 | 0.974 | 0.990 | 0.983 | 0.986 | 0.982 |
| 精炼产品 | 0.980 | 0.979 | 0.981 | 0.973 | 0.985 | 0.971 | 0.978 |
| 新能源材料 | 0.987 | 0.814 | 0.993 | 0.993 | 0.999 | 0.966 | 0.958 |
| 新能源应用 | 0.961 | 0.961 | 0.967 | 0.963 | 0.967 | 0.970 | 0.965 |
), ArticleFig(id=1240651359746314283, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=表7, caption=
2017—2022年产业链不同环节调整后创新效率测度结果
, figureFileSmall=null, figureFileBig=null, tableContent=
| 类型 | 产业链环节 | 调整后均值 | 均值 |
|---|
| 2017 | 2018 | 2019 | 2020 | 2021 | 2022 |
|---|
| 创新效率 | 矿产品 | 0.978 | 0.968 | 0.971 | 0.986 | 0.969 | 0.969 | 0.973 |
| 精炼产品 | 0.938 | 0.935 | 0.927 | 0.922 | 0.935 | 0.953 | 0.935 |
| 新能源材料 | 0.773 | 0.783 | 0.966 | 0.975 | 0.964 | 0.966 | 0.904 |
| 新能源应用 | 0.902 | 0.893 | 0.891 | 0.888 | 0.888 | 0.916 | 0.896 |
| 整体均值 | | | | 0.927 | | | |
| 纯技术效率 | 矿产品 | 0.991 | 0.994 | 0.998 | 0.996 | 0.986 | 0.983 | 0.991 |
| 精炼产品 | 0.957 | 0.955 | 0.945 | 0.947 | 0.949 | 0.981 | 0.956 |
| 新能源材料 | 0.783 | 0.969 | 0.974 | 0.982 | 0.965 | 1.000 | 0.945 |
| 新能源应用 | 0.935 | 0.925 | 0.918 | 0.917 | 0.918 | 0.944 | 0.926 |
| 规模效率 | 矿产品 | 0.987 | 0.974 | 0.974 | 0.990 | 0.983 | 0.986 | 0.982 |
| 精炼产品 | 0.980 | 0.979 | 0.981 | 0.973 | 0.985 | 0.971 | 0.978 |
| 新能源材料 | 0.987 | 0.814 | 0.993 | 0.993 | 0.999 | 0.966 | 0.958 |
| 新能源应用 | 0.961 | 0.961 | 0.967 | 0.963 | 0.967 | 0.970 | 0.965 |
), ArticleFig(id=1240651359872143410, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=EN, label=Table 8, caption=
Regression result analysis
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | 创新效率 | 纯技术效率 | 规模效率 |
|---|
| 市场竞争程度 | -0.242 8***(-3.29) | -0.233 4***(-3.13) | -0.130 0***(-3.14) |
| 供应商集中度 | 0.000 9***(3.08) | 0.001 2***(3.66) | 0.000 3(1.39) |
| 企业规模 | 0.000 05*(1.86) | 0.000 1***(3.37) | -0.000 007(-1.24) |
| 员工质量 | 0.000 9*(1.69) | 0.001 1*(1.74) | 0.000 3(1.03) |
| 融资结构 | -0.000 8***(-2.73) | -0.001 0***(-3.24) | -0.000 003(-0.20) |
| 股权集中度 | -0.001 7***(-4.16) | -0.001 6***(-3.52) | -0.001 1***(-4.10) |
| C | 1.003 2***(32.33) | 1.026 2***(29.20) | 1.026 4***(54.17) |
| ∑u | 0.086 9***(10.56) | 0.080 8***(9.63) | 0.041 6***(9.70) |
| ∑e | 0.059 3***(24.29) | 0.061 7***(22.23) | 0.039 7***(24.60) |
| N | 462 | 462 | 462 |
), ArticleFig(id=1240651359997972544, tenantId=1146029695717560320, journalId=1235980550691926019, articleId=1240631879011979563, language=CN, label=表8, caption=
回归结果分析
, figureFileSmall=null, figureFileBig=null, tableContent=
| 变量 | 创新效率 | 纯技术效率 | 规模效率 |
|---|
| 市场竞争程度 | -0.242 8***(-3.29) | -0.233 4***(-3.13) | -0.130 0***(-3.14) |
| 供应商集中度 | 0.000 9***(3.08) | 0.001 2***(3.66) | 0.000 3(1.39) |
| 企业规模 | 0.000 05*(1.86) | 0.000 1***(3.37) | -0.000 007(-1.24) |
| 员工质量 | 0.000 9*(1.69) | 0.001 1*(1.74) | 0.000 3(1.03) |
| 融资结构 | -0.000 8***(-2.73) | -0.001 0***(-3.24) | -0.000 003(-0.20) |
| 股权集中度 | -0.001 7***(-4.16) | -0.001 6***(-3.52) | -0.001 1***(-4.10) |
| C | 1.003 2***(32.33) | 1.026 2***(29.20) | 1.026 4***(54.17) |
| ∑u | 0.086 9***(10.56) | 0.080 8***(9.63) | 0.041 6***(9.70) |
| ∑e | 0.059 3***(24.29) | 0.061 7***(22.23) | 0.039 7***(24.60) |
| N | 462 | 462 | 462 |
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