The effect of new quality productivity on port sustainability: Evidence from China

The development of new quality productivity (NQP) provides fresh impetus and potential for the sustainable development of ports. Utilizing panel data from 44 coastal ports and their respective municipal administrative regions spanning from 2010 to 2021, this study empirically analyzes the impact of NQP on port sustainability and further examines the underlying mechanisms and heterogeneity of its effects. The findings reveal that an increase in NQP significantly enhances port sustainability. The results of mechanism tests indicate that heightened NQP fosters port sustainability by adjusting industrial structures and elevating urban green innovation levels, with the public's digital attention playing a positive moderating role. Heterogeneity analysis demonstrates that the promotional effect of NQP on port sustainability is stronger in city samples characterized by better business environments, superior soft environments, lower business costs, and those dominated by the secondary industry. This study elucidates the significance of NQP in fostering the sustainable development of ports, thereby providing policymakers with a robust foundation for optimizing port development strategies and enhancing sustainable capacity.