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

Table 1

Sequential covariate index system of the CBECSC system.

Sequence covariates	Secondary indicators	Content of the indicator	Unit of measure
Supply chains	Logistics revenue	Total express revenue in the city^1	100 million yuan
Foreign trade	Trade base	Total city imports and exports in the city^1	US$100 million
	Trade radiation effect	Total exports and imports in the provinces driven^2	US$100 million
E-commerce	E-commerce development	E-commerce development index of the city^3	—
	E-commerce scale	E-commerce scale index of the city^3	—
	E-commerce penetration	E-commerce penetration index of the city^3	—
E-commerce logistics	Logistics employment	Number of people employed in urban transport, storage and postal services in the city^1	Person
	Road freight volume	Urban road freight volume in the city^1	Ten thousand tons

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.