Xue, C. and Yang, X. 2023. Evaluation of Urban Logistics Competitiveness Based on Principal Component Analysis: --Taking 21 Cities in Sichuan Province as an Example. Academic Journal of Management and Social Sciences. 4, 3 (Oct. 2023), 26–30. DOI:https://doi.org/10.54097/ajmss.v4i3.12459.