Modelling the Coupled and Coordinated Development between China’s Cross-border E-commerce Supply Chain and Economic System

Table 2

Sequential covariate index system of the economic system.

Sequence covariates	Secondary indicators	Content of the indicator	Unit of measure
Economic development	Size of the economy	GDP of the city^1	100 million yuan
	Economic structure	Share of the tertiary sector in the city’s GDP^1	%
Social consumption	Disposable income	Per capital disposable income of urban residents in the corresponding province^2	Yuan
	Consumer spending	Per capital consumption expenditure of urban residents in the corresponding province^2	Yuan
Talent environment	Talent development	Education expenditure in the city^1	Ten thousand yuan
	Talent attraction	Talent attraction index of the city^4	—
Technological innovation	R&D input	Total R&D investment in the corresponding province^5	100 million yuan
	R&D intensity	R&D investment intensity of the corresponding province^5	%
	Science and technology expenditure	Science and technology expenditures in the city^1	Ten thousand yuan

Data sources: ¹, 2018 statistical yearbook by cities; ², 2018 statistical yearbook by provinces; ³, China e-commerce development index report (2017); ⁴, 2017 most attractive cities for talents and related data compilation; ⁵, 2017 national statistical bulletin on science and technology funding inputs.