1. Introduction
Energy is an essential foundation for human survival and economic development [
1,
2], which is becoming increasingly important in the industrialization of countries [
3]. The International Energy Agency (IEA) reports that global energy consumption is expected to increase by 54% by 2025 compared to 2020, while energy consumption in developing Asia is expected to double [
4]. However, the surge in energy consumption will bring environmental problems [
5]. Environmental pollution caused by energy consumption affects the sustainable development of the world economy and brings huge economic losses to China [
6]. Under the dual pressure of economic growth and environmental protection, the key to economic growth and carbon emission reduction is gradually improving green total factor energy efficiency by considering environmental and resource factors [
7]. Therefore, it is of great theoretical value and policy guiding significance to clarify the influencing factors of GTFEE and seek ways to improve GTFEE.
Meanwhile, financial development is vital in improving energy efficiency [
8,
9]. Baloch (2019) [
10] shows an inverted U-shaped relationship between financial development and energy efficiency; only when financial development reaches a certain level it can significantly impact energy efficiency improvement. Qu et al. (2020) [
8] found that financial development can influence energy efficiency through the scale economy effect, innovation driving effect, information spillover effect and structural adjustment effect. However, the nature of traditional finance has contributed to the obvious exclusion of financial services, with a large amount of high-quality financial resources concentrated in developed regions, large enterprises and high-income groups, to the exclusion of backward regions such as rural areas, small and medium-sized enterprises (SMEs) and low-income classes [
11]. Private enterprises, mainly SMEs, occupy a crucial position in the national economies of various countries; in China, for example, SMEs contribute 80% of employment, 70% of patented inventions, more than 60% of GDP and more than 50% of tax revenue. Therefore, whether the “financing difficulties” of SMEs and the low-income class can be effectively alleviated is not only a matter of survival of SMEs and the low-income class, but also affects macroeconomic development and environmental changes.
The dilemma faced by the development of traditional finance needs to be solved by innovative financial models in the new era. In recent years, the emergence of digital technologies represented by big data, cloud computing, artificial intelligence, and blockchain has hugely impacted traditional finance, and digital finance has emerged [
12,
13]. Digital finance emphasizes the equality and inclusiveness of access to financial services for different subjects. It provides financial services for low-income groups and SMEs by sharing information, lowering the threshold of access to financial resources, and covering “service blind spots” that are difficult to be covered by traditional financial institutions [
13]. Digital finance can reduce the travel activities of people to and from traditional financial institutions, thereby reducing energy consumption and improving GTFEE [
14]. Meanwhile, digital finance can expand public participation in environmental protection, which will enhance GTFEE. Is it worth considering the impact digital finance has on GTFEE and the potential mechanisms of such impact? However, to date, less literature has focused on the impact of digital finance on GTFEE. In view of this, this paper attempts to analyze the relationship between digital finance and GTFEE and explore whether and how digital finance contributes to the enhancement of GTFEE.
To answer the above questions, this paper empirically investigated the impact of digital finance on GTFEE by taking Chinese city panel data from 2011 to 2018 as samples. At the same time, considering that there may be endogenous problems between digital finance and GTFEE, the research method of this paper is set as a dynamic panel model. Further, this paper explores the mechanism of digital finance influencing GTFEE using the mediation effect model.
There are two reasons for using Chinese city-level data to verify the topic of this paper. First, the BP World Energy Statistical Yearbook 2021 shows that China has become the world’s largest energy consumer and carbon emitter [
15]. In 2021, China’s energy consumption accounted for 26.11% of the world’s total energy consumption. As the largest developing country globally, the contradiction between economic development and the environment in China is also a common problem faced by many developing countries [
16]. Second, China leads the world in digital finance scale and technology practices [
17], and the data on digital finance in Chinese cities is available.
The main contributions of this paper are as follows: first, we expand the research related to the economic effects of digital finance. The existing literature has mainly explored the impact of digital finance on poverty rates [
18], financing constraints of SMEs [
19], efficiency of financial services [
13], and environmental pollution [
20]. To the best of our knowledge, this paper is the first to expand related research on the economic effects of digital finance from the perspective of GTFEE, filling the gaps in the existing literature. Second, we expand the related research on the influencing factors of energy efficiency. The existing literature has explored the impact of factors such as industrial structure [
21], technological innovation [
22], energy consumption structure [
23], environmental regulation [
24], urbanization [
25], and financial development [
9] on energy efficiency, but has not examined the impact of digital finance on energy efficiency. To the best of our knowledge, this paper is the first to expand the relevant research on the influencing factors of energy efficiency from the perspective of digital finance, filling the gaps in the existing literature. Third, we explore the impact mechanism of digital finance on GTFEE, which will help us to understand the relationship between digital finance and GTFEE more deeply. And we find that digital finance can improve GTFEE through the “green technology innovation effect” and the “industrial structure upgrading effect”, the former effectively verifies the existence of the “Porter effect”. Fourth, we focus on the inclusiveness of digital finance. Through a series of heterogeneity tests, we find that digital finance is more effective in improving energy efficiency in economically underdeveloped cities and energy-scarce cities, effectively verifying the existence of the inclusive function of digital finance.
The structure of this paper is as follows:
Section 2 reviews the relevant literature.
Section 3 summarizes the background of digital finance and presents the theoretical mechanism between digital finance and GTFEE.
Section 4 provides an introduction to methodology and data.
Section 5 presents the empirical results of the paper.
Section 6 presents conclusions and implications.
2. Literature Review
Two branches of literature relevant to our research exist. The first branch related to this paper is the measurement of energy efficiency and the factors influencing energy efficiency. Regarding research methodology, energy efficiency measures can be divided into single factor energy efficiency and total factor energy efficiency. Early energy efficiency studies mainly referred to single factor energy efficiency, meaning that only energy as a single input factor was considered. Sun et al. (2019) [
26] stated that the method of measuring single factor energy efficiency may be too simplistic, mainly because it relies only on a single input and ignores other inputs such as capital and labor. The so-called total factor energy efficiency means that production factors such as energy, capital, and labour are simultaneously used as input factors. Hu and Wang (2006) [
27] proposed total factor energy efficiency based on the data envelopment method, which effectively overcomes the shortcomings of traditional single factor energy efficiency. However, the conventional calculation of total factor energy efficiency is also flawed, mainly because it does not include undesired output–pollutants [
28]. Zhang et al. (2015) [
29] incorporate energy consumption and pollutant emissions into total factor energy efficiency, defined as green total factor energy efficiency (GTFEE). Gao et al. (2022) [
1] point out that compared with single factor energy efficiency and total factor energy efficiency, green total factor energy efficiency (GTFEE) is more effective and comprehensive to reflect the efficiency of the energy-economic system. Currently, there are two main measures of GTFEE. The first measure is data envelopment analysis (DEA) based on mathematical programming methods. The other measure is parametric stochastic frontier analysis (SFA), built on econometric techniques.
Numerous scholars from different perspectives have studied the factors influencing energy efficiency. It was found that factor endowment [
30], industrial structure [
21,
23], technological innovation [
22,
26], energy consumption structure [
23], energy price [
31,
32], trade openness [
33,
34], economic development [
23], government intervention [
35], industrial agglomeration [
36,
37], environmental regulation [
24,
38], urbanization [
25,
39] and financial development [
8,
9] are important factors that affect energy efficiency. For example, based on firm-level data from 2003 to 2017 in India, Haider et al. (2021) [
22] find that investing in R&D expenditures and patenting activities can improve the energy efficiency of firms. Xin et al. (2020) [
32] provide evidence that market-oriented electricity price has a stable positive correlation with energy efficiency in the short and long term. Wei et al. (2020) [
34] find that increasing imports effectively improve total factor energy efficiency. Based on the data from the Japanese industry, Tanaka et al. (2021) [
37] discovered that industrial agglomeration affects energy efficiency.
The other branch of the relevant literature is mainly concerned with evaluating the economic effects of digital finance. It has been shown that digital finance is an important tool for poverty alleviation [
40], and it increases the financial availability of vulnerable groups such as farmers [
41] thereby reducing poverty rates [
18]. Meanwhile, inclusive digital finance can alleviate the financing constraints of small and medium-sized enterprises [
19], thereby improving the green technology innovation of enterprises [
42]. Other studies have found that digital finance has brought enormous competitive pressure to traditional financial institutions, thereby improving the efficiency of financial services [
13]. In addition, Le et al. (2020) [
20] and Wang et al. (2022) [
43] show that inclusive digital finance effectively reduces environmental pollution.
By analyzing the above literature, few researchers have studied the relationship between digital finance and GTFEE. Even less literature explores the channels of the impact of digital finance on GTFEE. However, as a new financial business model, digital finance may impact GTFEE by affecting the macro-economy, micro-enterprises and individuals. Compared with the existing literature, this paper fills the research gap in the relationship between digital finance and GTFEE.
7. Conclusions and Implications
7.1. Conclusions
The key to achieving economic growth and reducing carbon emissions is to increase GTFEE, and digital finance has become an important factor in enhancing GTFEE. This paper takes the panel data at the city level in China from 2011 to 2018 to comprehensively evaluate digital finance’s impact on GTFEE.
First, we develop green total factor energy efficiency (GTFEE) to measure urban energy efficiency. Compared with single factor energy efficiency and total factor energy efficiency, green total factor energy efficiency (GTFEE) is more holistic to reflect the efficiency of the energy-economic system. Second, we use SYS-GMM to reveal the causal relationship between digital finance and GTFEE, which can effectively alleviate the endogeneity problem between them.
This paper explores the relationship between digital finance and GTFEE for the first time, filling a gap in the existing literature. We find that digital finance significantly improves GTFEE, and the conclusions remain the same across a series of robustness tests.
We discuss in depth the mechanism of the impact of digital finance on GTFEE. Through a mediating effect model, we find that digital finance can improve GTFEE by promoting urban green technology innovation and industrial structure upgrading, the former of which demonstrates the existence of the “Porter effect”.
In addition, we demonstrate the existence of the inclusiveness of digital finance. Through a series of heterogeneity tests, we find that digital finance significantly improves GTFEE in central and western cities and small cities. At the same time, it has a less significant effect on GTFEE in eastern and large cities. Meanwhile, digital finance has a more significant effect on GTFEE in non-resource-based cities compared with resource-based cities. These results suggest that digital finance is inclusive, and it is easier to achieve energy conservation and emission reduction goals in economically underdeveloped and energy-scarce cities.
7.2. Implications
This paper puts forward the following policy recommendations based on the above conclusions.
(1) We examine the relationship between digital finance and GTFEE for the first time and find that digital finance significantly improves GTFEE. This finding is helpful to promote the Chinese government to further develop digital finance and fully utilize the positive impact of digital finance on energy and economy. First, government departments should follow the trend of financial digitization and improve the construction of digital financial infrastructure, so that more people and enterprises can enjoy digital financial services. Second, government departments guide traditional financial institutions to use digital technologies represented by big data, cloud computing, artificial intelligence and blockchain to innovate financial services through encouragement policies.
(2) We discuss in depth the mechanism of the impact of digital finance on GTFEE, which is beneficial to the government departments of Chinese cities to implement various policy measures to improve GTFEE. First, government departments should guide the inflow of funds to green technology-based enterprises, and increase financial support for these green technology-based enterprises to carry out green technology innovation activities. Secondly, government departments need to provide financial support for enterprises to transform from labor-intensive to technology-intensive, so as to promote the optimization of regional industrial structure.
(3) We demonstrate the existence of the inclusiveness of digital finance. Digital finance is more likely to achieve energy efficiency goals in economically underdeveloped and energy-scarce cities. Therefore, central and western cities and small cities should give full play to the inclusiveness of digital finance and make more efforts to improve the level of local digital finance in order to catch up with the financial development of eastern cities and big cities more quickly.