Assessing the impacts of belt and road investment on port voyage density and port-city economic growth

This study examines how Belt and Road Initiative port investment translates into maritime activity and port-city economic growth along the Maritime Silk Road. We frame impacts as a conversion process from investment to operational activation and then to local growth, and test whether this conversion is stronger where baseline constraints limit service capture. Using a multi-country panel of MSR port cities from 2014 to 2023, we estimate conservative fixed-effects models with port fixed effects and country-by-year controls, incorporate adjustment lags consistent with infrastructure lead times, and apply strict temporal ordering to assess whether earlier ship-call density predicts later GDP growth after accounting for prior investment. Results show that investment relevance is conditional on conversion capacity: associations are more consistently detected where operational and institutional conditions support recurring services and local value capture, and are weaker for already advantaged hubs. Evidence further indicates that lagged ship-call density provides a clearer link to subsequent GDP growth than contemporaneous reduced-form investment–growth correlations, consistent with gradual network and local adjustment. These findings imply that BRI appraisal and monitoring should emphasize conversion-oriented portfolios and operational leading indicators, including ship-call density and port-time performance, and bundle hard infrastructure with facilitation and coordination reforms where procedural constraints bind. The results are best interpreted as mechanism-consistent evidence under strict timing rather than a full causal mediation decomposition.