B.5 6 Extensions and Research Opportunities

1. Two-Stage Designs: Separate between-cluster assignment (e.g., policy) and within-cluster nudges (e.g., messages).
2. Dynamic Interference Models: Incorporate time-varying exposure using synthetic controls.
3. Adaptive Clustering: Continuously update embeddings as listing inventory changes.
4. General Equilibrium Simulation: Embed results in a structural model to forecast long-run impacts.

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