The eastern coastal advantage in China's marine economy is not a matter of luck or simple geography. It is the measurable outcome of industrial agglomeration, port-based logistics, and marine technology innovation, as the study on natural resource total factor productivity (NTFP) makes clear. By integrating a static SBM‑DEA model with a three‑tier multi‑frontier decomposition, the researchers isolate exactly why the coast outperforms inland regions by a factor of 2.3 to 2.8. This is not a vague narrative about coastal success; it is a calibrated, empirical diagnosis of where efficiency is won and lost. For policymakers, that distinction matters. The framework does not just rank regions; it attributes the gap to regional technology disparities, provincial heterogeneity, and intra‑provincial inefficiencies, which means the levers for improvement are no longer abstract.
The three‑echelon structure within the coast is the most actionable finding here. The Yangtze River Delta and Pearl River Delta define the national efficiency frontier, while Hainan and Guangxi lag primarily because of severe intra‑provincial efficiency losses. That is a precise, targeted insight. It tells a provincial official in Guangxi that the problem is not a lack of natural resources or even inferior technology compared to Shanghai, but rather how resources are managed internally. This aligns with the broader pattern we have observed in related coverage, such as Record Port Activity Reflects Rising Chinese Exports Amid Trade Uncertainty, where record throughput at Chinese ports underscores the scale of coastal logistics but also raises questions about whether that volume translates into sustainable productivity gains. Similarly, Integrated Subsea Infrastructure Shifts to Enhance Indian Ocean Connectivity highlights how shifting connectivity routes can alter regional advantages, a reminder that the coastal edge is not static; it responds to infrastructure and policy choices.
What we find most striking is the absence of significant cross‑provincial productivity spillovers. The study shows high‑efficiency clusters concentrated in leading coastal provinces, but the benefits do not diffuse to neighbors in a statistically meaningful way. This is a direct challenge to the assumption that growth in a leading province will naturally lift a lagging one. For a country pursuing dual‑carbon goals and integrated marine governance, this means targeted, echelon‑based strategies are not optional; they are the only honest approach. The absolute gap between coast and inland remains substantial, and without deliberate intervention, it will persist. Our take is straightforward: measuring efficiency is the first step, but the decomposition is what turns data into decisions. The takeaway a reader can quote: "Intra‑provincial inefficiency, not resource scarcity, is the binding constraint for lagging coastal regions." That is the kind of specific, actionable insight that should inform where the next round of marine economy investment goes, not as a general nod to innovation, but as a precise allocation toward closing the MI index gap. Watch whether Hainan and Guangxi adopt policies that target internal logistics and resource allocation, because that will be the real test of whether this framework influences governance.