This article demonstrates equivalence of marginal policy effect and its derivative in nonseparable models, suggesting a new identification strategy.
This article investigates the structural interpretation of the marginal policy effect (MPE) within nonseparable models. We demonstrate that, for a smooth functional of the outcome distribution, the MPE equals its functional derivative evaluated at the outcome‐conditioned weighted average structural derivative. This equivalence is definitional rather than identification‐based. Building on this theoretical result, we propose an alternative identification strategy for the MPE that complements existing methods.
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Wang et al. (2025) studied this question.
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