What the study found
China’s coal market shows a stable long-term relationship among coal prices, raw coal production, port inventory, ocean freight rates, international oil prices, and import volumes. The study also finds that port inventory, logistics costs, and oil-price substitution all play measurable roles in price transmission.
Why the authors say this matters
The authors say coal price stability is important for national energy security and macroeconomic stability. They suggest the findings support a dynamic early-warning mechanism based on port inventory thresholds and flexible import quotas to help buffer domestic supply shocks.
What the researchers tested
The researchers used monthly data from May 2016 to August 2025 and built a six-variable Vector Error Correction Model, or VECM, to examine long-term equilibrium and short-term dynamics in China’s coal market. The model included coal prices, production, port inventory, ocean freight rates, international oil prices, and import volumes.
What worked and what didn't
A stable cointegration relationship was found among the core variables, and this long-term equilibrium remained effective despite market volatility in 2021. Port inventory had a significant negative lag effect on prices, ocean freight rates showed cost compounding effects, and international oil prices showed energy-substitution effects with more persistent shocks; the study also says effective supply, which combines inventory and logistics, explains pricing better than nominal production alone, while logistics constraints amplify price volatility.
What to keep in mind
The abstract does not provide detailed model diagnostics or robustness checks. The summary is limited to the variables and time period described in the abstract.
Key points
- The study finds a stable long-term relationship among coal prices, production, inventory, freight rates, oil prices, and imports.
- Port inventory is reported to have a significant negative lag effect on coal prices.
- Ocean freight rates and international oil prices are described as having cost and substitution effects, respectively.
- The authors say effective supply, not just nominal production, better explains pricing.
- Logistics constraints are reported to amplify coal price volatility.
Disclosure
- Research title:
- China coal prices show long-term links with inventory and logistics
- Publication date:
- 2026-03-05
- DOI:
- 10.3390/en19051299
- OpenAlex record:
- View
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