Study on the Formation and Evolution Conditions of Coagglomeration between the Manufacturing Industry and the Logistics Industry Based on Endogenous Logistics Cost

The co-agglomeration between manufacturing industry and logistics industry is the main spatial manifestation of the coordinated linkage and integrated development of the two industries, and it is also a standard to test whether the linkage and integrated development of the two industries is effective. In the traditional new economic geography model, when the logistics cost is exogenous, the description of the formation conditions of the two industries' co-agglomeration is vague and difficult to quantify. The logistics sector is introduced into the agglomeration model as an independent sector, by establishing the linkage relationship between the average variable cost of logistics industry and the degree of agglomeration of manufacturing industry through industrial correlation, the endogenous treatment of logistics cost is realized; According to the degree of regional manufacturing agglomeration and the possible forms of two industry agglomeration, the average variable cost of logistics enterprises is solved, and the formation and evolution conditions of co-agglomeration of logistics industry and manufacturing industry under the condition of endogenous logistics cost are obtained. Through theoretical derivation and numerical simulation, it is found that the formation of co-agglomeration of manufacturing and logistics industry in a region is affected by two thresholds of logistics average variable costs, and the higher the degree of agglomeration of manufacturing industry in the region, the greater the interval width of two thresholds for complementary agglomeration and the smaller interval width of two thresholds for extruding agglomeration; when the logistics average variable costs is in the range between two thresholds, the degree of manufacturing and logistics industrial co-agglomeration is being U-shaped relationship with the manufacturing agglomeration, otherwise inverted U-shaped relationship. This study is helpful to grasp the general rules of the formation and evolution of the co-agglomeration of manufacturing and logistics industry. It provides theoretical support for promoting the deep integration of the two industries, ensuring the stability of the industrial chain and supply chain and high-quality economic development.