On August 31, 2016, seven ministries including the People's Bank of China and the Ministry of Finance jointly issued the “Guiding Opinions on Building a Green Financial System”, marking the beginning of the construction of China’s green financial policy system. Since June 2017, the State Council has successfully set up pilot areas of green financial reform in five provinces, so this paper chooses 2017 as the effect point of GFRP to evaluate the impact of GFRP on GTI capabilities.
Selection of weight coefficient of the synthetic control group
To accurately evaluate the impact of the GFRP on GTI in different provinces, this paper constructs a corresponding synthetic control province for each green financial reform pilot, using GDP per capita, industrial structure, foreign investment, technology spending, and trade openness as prediction variables to fit the synthetic control provinces. The weight coefficients of the control group provinces synthesized by the pilot provinces of GF reform are shown in Table 3.
Table 3 Synthetic control group weight coefficient table
Zhejiang
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Jiangxi
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Guizhou
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Area Weights
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Area Weights
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Area Weights
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Anhui 0.236
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Anhui 0.049
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Gansu 0.241
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Henan 0.001
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Fujian 0.103
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Guangxi 0.270
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Jiangsu 0.134
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Gansu 0.315
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Qinghai 0.417
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Shanghai 0.259
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Hainan 0.127
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Shaanxi 0.072
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Sichuan 0.369
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Ningxia 0.176
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Shanxi 0.205
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Chongqing 0.025
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Xinjiang
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Guangdong
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Area Weights
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Area Weights
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Fujian 0.098
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Beijing 0.472
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Gansu 0.001
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Jiangsu 0.046
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Inner Mongolia 0.366
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Shanghai 0.338
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Hainan 0.068
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Sichuan 0.144
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Ningxia 0.256
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Qinghai 0.134
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Shanxi 0.074
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Shaanxi 0.003
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After fitting, the larger the synthetic contribution rate of the control group province, the more similar it is to the characteristics of the pilot province, and the weight is 0, which means that it is far from the characteristics of the pilot province. From this, the weights of the provinces that make up the synthetic control group of pilot cities are obtained. Among them, the provinces with positive synthetic contribution rates to Zhejiang are Anhui (0.236), Henan (0.001), Jiangsu (0.134), Shanghai (0.259), Sichuan (0.369); The provinces with positive synthetic contribution rates to Jiangxi are Anhui (0.049), Fujian (0.103), Gansu (0.315), Hainan (0.127), Ningxia (0.176), Shanxi (0.205), Chongqing (0.025); The provinces with positive synthetic contribution rate to Guizhou are Gansu (0.241), Guangxi (0.270), Qinghai (0.417), Shaanxi (0.072); The provinces with positive synthetic contribution rate to Xinjiang are Fujian ( 0.098 ), Gansu (0.001), Inner Mongolia (0.366), Hainan (0.068), Ningxia (0.256), Qinghai (0.134), Shanxi (0.074), Shaanxi (0.003); The provinces with positive synthetic contribution rate to Guangdong are Beijing (0.472), Jiangsu (0.046), Shanghai (0.338) and Sichuan (0.144).
The impact of green financial reform pilots on Green Technology Innovation
First, the SCM is used to evaluate whether the promulgation of the GFRP can have an impact on GTI in each pilot province. Figure 1a-e shows the changes in the GTI capabilities of pilot provinces from 2010 to 2020. The dotted line is the evolution path of the GTI capability of the provinces synthesized by the weight of other provinces except for the pilot provinces, the solid line is the evolution path of the actual GTI capability of the pilot provinces, and the year of the vertical dotted line is the year when the policy is implemented. It can be seen from the figure that before 2017, the GTI capabilities of the synthetic provinces and the real provinces were very similar, and the difference is small, which shows that the synthetic provinces have well-matched the changes in the GTI capabilities of the pilot provinces. After 2017, the dotted line and the solid line gradually began to deviate, and the degree of deviation gradually increased. The GTI capacity of the synthetic provinces of Zhejiang, Jiangxi, Guizhou, and Guangdong is significantly lower than that of the real pilot provinces, which means that the green financial reform policy can promote the improvement of regional GTI ability. However, the synthetic curve in Xinjiang is higher than the actual curve, indicating that the GFRP has not played a catalytic role in Xinjiang.
In addition, according to the idea of the SCM, the effect size of the GFRP can be determined by using the difference between NGP in the pilot provinces after the policy is implemented and NGP in the synthetic provinces. That is to say, the difference between the solid line and the dotted line is the effect of the pilot policy on the regional GTI capability. Figure 2a-e shows the net effect of the GFRP. It can be inferred from the figure that in the early stage of policy implementation, the GTI capabilities of all pilot provinces except Xinjiang have been significantly improved, but with the passage of time, this promoting effect began to show a downward or stable trend. Since the five pilot provinces are different in terms of economic development level, industrial structure, resource endowment, and environmental carrying capacity, the degree of policy impact will also be different to a certain extent. By 2020, NGP in Zhejiang Province reached 16,325, an increase of 144.77% compared with 2016, while NGP in Guangdong Province in 2020 was 31,311, an increase of 198.17% compared with 2016, Zhejiang and Guangdong are already economically developed regions, and the proportion of their industrial structure has entered the stage of “321”. The tertiary industry has become an important driving force for economic growth, and the industries above the designated size are mainly high-tech industries and equipment manufacturing industries. With the help of pilot policies, its GTI ability has been further improved by virtue of rich resources and strong financial resources, and the degree of policy influence is more obvious than that of other pilot provinces. As a representative of the central provinces in terms of economic aggregate, Jiangxi is rich in green resources and has obvious ecological advantages. To avoid taking the development path of pollution first and then treatment, Jiangxi Province builds a green development model with the help of GFRP. By 2020, NGP in Jiangxi Province reached 2,191, an increase of 178.75% compared with 786 in 2016. It can also be seen from Fig. 2 that the net effect of policies in Jiangxi Province is on the rise. Guizhou Province is also rich in green resources, but its economic aggregate is at the bottom of the country and belongs to an economically underdeveloped area. In the past, Guizhou Province traded economic benefits at the cost of the environment, which led to serious environmental problems. There is an urgent need for a way to alleviate ecological problems by taking into account both economic and ecological effects. The pilot program of GF provides such an opportunity. In 2020, NGP in Guizhou Province was 1519, 1.18 times that in 2016, which has been improved to a certain extent, but the promotion effect of the policy began to decline after 2019, which also shows that the pilot policy lacks certain sustainability. Before the policy took place in Xinjiang, the fit between the actual value and the synthetic value of NGP was very high, but after the policy took place, the deviation between the actual value and the synthetic value began to appear, and the actual value was significantly lower than the synthetic value, which the implementation effect of the pilot policy in Xinjiang is not good, and it has not played a role in promoting the improvement of GTI ability and even reduced the GTI ability in the region.
In general, the implementation of GFRP has different impacts on different provinces. For Zhejiang and Guangdong provinces with relatively complete financial systems and economically developed regions, it will bring greater promotion and further improve their GTI capabilities, but the promotion effect of policy effects is limited. After reaching a certain peak, this promoting effect will gradually decline. It has a relatively stable promotion effect on the provinces with the economic development level in the middle. Although the economically underdeveloped areas have been affected by the policy, the GTI ability has been improved to a certain extent, but the same problem is the instability of the policy promotion effect. Like Guangdong Province, after the implementation of the policy, the GIT capacity of Guizhou Province has been improved, and after reaching a certain level, the promotion effect begins to weaken. Of course, policy effects are not applicable to all regions. After the policy is implemented, the GTI capacity of the Xinjiang region has increased but the growth rate has dropped sharply. The net effect of the policy is also a stated of negative effect is mainly due to the implementation of the pilot policy in Xinjiang, which pays more attention to improving the utilization rate of various resources and the protection of the environment, while ignoring human resources, technology introduction, technology investment, etc., which are indispensable to improve GTI The lack of these elements hinders the improvement of GTI capabilities in newly built areas and ultimately makes it difficult for the GFRP to promote the development of local GTI capabilities.
Robustness check
To evaluate whether the evaluation effect of the policy is robust and significant, and verify that the difference between real pilot provinces and synthetic provinces is caused by the implementation of the policy rather than other unobservable factors. Here, a Permutation Test method similar to the Rank Test in statistics proposed by Abadie et al. (2010) is used to judge whether other provinces have the same situation as the pilot provinces, how likely is it. First, the SCM is used to construct the synthetic GTI curve, and a series of random “policy effects” (true real value and composite value error) are obtained, and then the comparison between the policy effect of the pilot provinces and the random error distribution is made. If the gap between the policy effects of the two is large enough, it is reasonable to consider that the pilot policies have a remarkable effect. When using this method, to improve the accuracy of the robustness test, we excluded provinces whose RMSPE value was 2 times higher than the pilot provinces. The specific experimental results are shown in Fig. 3.
Figure 3 (a)-(e) shows the difference distribution after excluding provinces with a poor-fitting degree. Before 2017, Zhejiang Province had a very good degree of fitting with other provinces. After the implementation of the policy, the gap between Zhejiang Province and other provinces gradually widened, and it was located outside other provinces. This means that the pilot policy has improved the GTI capacity of Zhejiang Province, and it also shows that there is only a 1/21, or 4.76% chance, that there is such a large gap between Zhejiang and synthetic Zhejiang, and it can be considered that NGP in Zhejiang Province has increased significantly at the 5% level. Similarly, there was only a small difference between Guangzhou and the provinces in the control group before the policy was implemented, and the gap gradually widened after 2017, confirming the role of the GFRP in promoting the GTI capability of Guangdong Province. It can be seen from the figure that there is a 1/22 or 4.55% chance that the gap between Guangdong and synthetic Guangdong will be the same. It can be considered that at least at a significant level of 5%, the improvement of the GTI capacity of Guangdong Province by the pilot policy is not due to cause by other accidental factors. For Jiangxi Province and Guizhou Province, there is a good degree of fit before the implementation of the policy, and there is no huge gap with other provinces after the implementation of the policy. As of 2020, only two provinces have higher green patents than Jiangxi. Therefore, it can be considered that Jiangxi Province affirms that the increase in NGP is due to policies at a significant level of 5% (1/20), while Guizhou has a probability of 5.56% (1/18), rejecting the impact of external accidental factors on GIT ability at the significant level of 10%. Although Xinjiang has a good degree of fit with other provinces before the occurrence of the policy, it still has no big gap with other provinces after the occurrence of the policy. Therefore, it can be considered that the reason for the reduction of the improvement rate of green innovation ability in Xinjiang is not only due to the policy, but also other external accidental factors, which together lead to the reduction of the improvement rate of GIT ability in Xinjiang, this is also consistent with the above net effect analysis results in Xinjiang.
Time of policy modification. This paper tests the robustness of the policy implementation effect from the pilot policy implementation level by changing the policy occurrence time to 2015. It is assumed that the policy’s occurrence time is shifted from 2017 to 2015, and then the implementation effect of the policy is re-tested through the SCM. The specific test results are shown in Fig. 4. After adjusting the policy occurrence time, whether before or after the policy occurred, NGP in the pilot provinces and NGP in the synthetic provinces did not have a large gap, and the degree of fit was good. The gap between the two began to appear in 2017 and gradually widened, indicating that the policy effect will only work after 2017, and it also shows that changing the policy time to 2015 has no effect, proving that the policy effect result obtained by the SCM is robust in time.
Placebo test. To further verify the robustness of the GFRP, this paper draws on the practice of Abadie et al. (2015) and selects a province that has not been set up as a pilot during the sample period. This paper selects various characteristics related to the pilot province, and the similarity is the highest, that is, the provinces in the control group with the highest contribution rate are synthesized when fitting the pilot provinces. Assuming that it and the pilot provinces have implemented the same policy treatment in the same year, and then conduct the same analysis according to the SCM, if the resulting policy effects are much smaller than the differences in the empirical analysis, it means that the pilot provinces and the synthetic provinces The difference in NGP does come from the pilot policy (that is, the results of the empirical analysis are valid), otherwise, the results of the empirical analysis are invalid. Accordingly, this paper selects Sichuan, Gansu, Qinghai, Inner Mongolia, and Beijing according to the weights in Table 1, and uses the SCM to make the actual and synthetic curves of NGP in the five provinces. Figure 5a-e shows the specific experimental results. As shown in the figure, the synthetic paths of Sichuan, Gansu, and Beijing are significantly lower than the real paths, and even have a negative effect, indicating that the policy implementation effect in this province is poor. For Qinghai Province, although the real path is higher than the synthetic path, the difference is small and the policy effect is not obvious. Similarly, the Inner Mongolia region also has a good degree of fit, the difference is small, and the policy effect is not significant. It can be inferred that the province with the highest similarity with each pilot province has an unsatisfactory policy effect after assuming that it has suffered a policy shock. This proves that the policy effects of the green financial reform pilots obtained above are not due to accidental factors.