Table 2.
Index system of city digital economy development index.
| Primary index | Secondary index | Original index | Reference |
|---|---|---|---|
| City digital economy development index | Internet consumer groups | Number of Internet users | Liang et al. (2021), Zhao et al. (2020) |
| Internet-related practitioners | Number of computer service and software employees | ||
| Internet-related output | Telecom business volume | ||
| Mobile Internet consumption volume | Number of mobile phone users | ||
| Financial technology development | Peking University Digital inclusive financial index | ||
| ABCDI innovation enthusiasm | Word frequency of 20 keywords such as artificial intelligence, blockchain, cloud computing, big data and Internet of things. | Chen and Zhang (2021) | |
| ABCDI innovation output | Number of applications for five digital technology patents, including ABCDI |
Note: The keywords are the same as those used by Chen and Zhang (2021).