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What determines the diffusion of policy innovations among locali-ties? In order to answer this question, this study tested empirically competingmodels of the diffusion of local policy innovations by analyzing the diffusionprocess of the local information disclosure acts among Korean local govern-ments. In doing so, two existing models-the geographic proximity model and theinternal attributes model-and a newly proposed model here-the vertical influencemodel-are analyzed. Specifically, employing factors reflecting the presumptionsof each model, regression analyses were performed on two dependent variables:the adoption and the adoption speed of local policy innovations. For the adop-tion, both the internal attributes model and the vertical influence model weresupported. But the geographic proximity model was not supported. For adoptionspeed, again the two models were supported, but the geographic proximitymodel failed to find support again, which necessitates a more rigorous analysis,as the model has widely gathered supportive evidences. The newly proposedtheoretical model was consistently supported in our analyses, which signifiesthat the diffusion of local innovations is not insulated from the influences ofupper authorities.