What type of study is this?

This is a Dual-policy identification framework study (also classified as: Multi-period difference-in-differences model, Event study analysis).

September 10, 2025SystemsOpen Access

Unpacking the Effects of Heterogeneous Incentive Policies on Sea–Rail Intermodal Transport: Evidence from China

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Analysis reveals how heterogeneous incentive policies impact container throughput in sea-rail transport, suggesting improved policy design.

Both railway freight price subsidies and freight train expansion significantly increased container throughput in China.
Railway freight price subsidies had stronger, lagged effects, while freight train expansion gave quick but short-lived responses.
Impacts were more pronounced in short-distance transport but weakened over longer distances, indicating spatiotemporal heterogeneity.
The number of participating entities mediated effects, highlighting the importance of information sharing in optimizing policies.

Ma et al. (2025) studied this question.

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Analysis reveals how heterogeneous incentive policies impact container throughput in sea-rail transport, suggesting improved policy design.