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A village receives a new agricultural advisory service, and farmers in a neighbouring untreated village begin using advice shared by their relatives. Why does this complicate evaluation?

Answer and explanation

Correct answer: The comparison village may be indirectly affected by the programme through information spillovers

A comparison group is less informative when it receives some benefits indirectly from the intervention. These spillover effects can reduce the observed difference between treated and untreated groups.

Related tags

Spillover EffectsAgricultural ExtensionProgramme EvaluationSocial Networks

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