Evolution Model on Relationship between Logistics and Economy of Port Cities and Its Application

Logistics and economy influence each other, and their relationship is dynamically changeable. The economy of different stages exhibits various demand for logistics. In order to explore the evolution law of the relationship between logistics and economy, this paper establishes an index system, a comprehensive comparison platform and an evolution model by the methods of principal component analysis and logistic equation. Then an empirical analysis is made, which reveals that there are three evolution stages about the relationship: Logistics industry is in a low growth rate, and it lags behind economy; Logistics industry is in a rapid growth rate, and it exceeds economy; The growth rate of logistics is reducing, and logistics industry tends to the limit value. Logistics and economy maintain steady relationship between supply and demand. To sum up, the evolution model is effective, and it can be applied to other port cities.