While maritime transport remains the backbone of global commerce, recent research by Réka Juhász (UBC, NBER, CEPR), Dávid Krisztián Nagy (CREI, CEPR), Claudia Steinwender (LMU Munich, CEPR) and Woan Foong Wong (University of Oregon, NBER, CEPR) reveals a landscape radically reshaped by containerisation and shifting geopolitical control. Utilising granular data ranging from digitised historical records to georeferenced ship movements, the authors synthesise how technology has transformed the geography of trade.
One of the paper’s primary results is the intensifying concentration of shipping activity at the top of the port distribution. A handful of dominant ports account for a disproportionate share of global trade, reflecting massive scale economies reinforced by containerisation. Yet, this concentration is not static, as historical giants like New York and London have been displaced by Asian hubs such as Singapore and Shanghai. The authors show that this churn is driven by the changing input requirements of maritime technology: containerisation demands greater natural port depth to accommodate larger ships and vast amounts of land for modern terminals. This has induced a “cost-space trade-off” where port activity often migrates toward city outskirts where land is less expensive.
Beyond physical geography, the research highlights a significant pivot toward state-owned infrastructure, particularly by Chinese firms. The authors find that Chinese public port ownership increases the scale of operations for both Chinese and non-Chinese carriers. However, the efficiency gains (evidenced by reduced ship turnaround times) accrue primarily to Chinese vessels. This suggests that ownership confers strategic advantages, such as preferential treatment or terminal prioritisation, rather than just general operational improvements.
These shifts carry profound implications for international relations and economic resilience. The hub-and-spoke network offers smaller nations access to large-scale transport efficiencies, yet it simultaneously creates critical bottlenecks prone to both congestion and geopolitical risk. Control over these gateways, particularly near maritime choke-points, may serve as a mechanism for building economic dependence and pursuing military dual-use objectives. The authors argue that global welfare depends on navigating the inherent tension between network efficiency and the strategic motives of the states that control these critical nodes.
