Port Logistics Policies Evaluation Based on Difference-in-Difference Model

Abstract

Abstract. In order to study port logistics policies' impact on related entities of port logistics, this paper try to use difference-in-difference model (DID model) in port logistics policy evaluation. Reviews related port logistics policies announced recent years in China, evaluates the policies impact on public port enterprises, and demonstrates the feasibility of using DID model to evaluate the port logistics policies. Based on whether a public port enterprises develop port logistics business, defines the public p ort enterprises which develop port logistics busine ss as the experimental group, others as the control group, and establishes DID mo del and evaluates the policy influence. Evaluation results show that the port logistics policies have a negative impact on t he gross profit of the experimental group, and DID model can be use d in port logistics policies evaluation. Perhaps the strengthening of infrastructure construction, diversification and expansion of development channels enhance the operating costs of port enterprises in short-term and result in short -term earnings decline.