Local Government Policy Diffusion in a Decentralised System: Childbirth Support Policy in South Korea

South Korean local governments have recently adopted pronatalist policies to cope with the pressing problem of low and declining fertility, despite this central coordination by the national government has been limited in this policy domain. This study attempts to explain the process by which childbirth support policies have spread among localities over time by addressing two questions: whether interjurisdictional and internal factors of policy diffusion have been at work; and how vertical and horizontal diffusion mechanisms have interactively affected local policy adoptions in the developing country. Empirical findings show that horizontal and vertical mechanisms of diffusion considerably outperform intrajurisdictional factors in spreading childbirth support policies among localities. Furthermore, the vertical influence from the central government has a positive conditional effect that stimulates horizontal interactions among local governments for policy formulation. These findings thus suggest that horizontal interactions among localities can provide an important route for the nationalisation of a domestic social policy in the nascent decentralised system.