In 1969, political scientist Jack Walker published 'The Diffusion of Innovations among the American States' in the American Political Science Review. 'Walker 1969' has since become a cornerstone of political science, packed with ideas, conjectures, and suggestions that spawned multiple lines of research in multiple fields. In good Kuhnian fashion, Walker 1969 is important less for the answers it provides than for the questions it raises, inspiring generations of political scientists to use the political, institutional, and policy differences among the states to understand policymaking better. Walker 1969 is the rock on which the modern subfield of state politics scholarship was built, in addition to inspiring copious research into federalism, comparative politics, and international relations. This Element documents the deep and extensive impact of Walker 1969 on the study of policymaking in the US states. In the process, it organizes and analyzes that literature, demonstrating its progress and promise.

Policy Diffusion Dynamics in America integrates research from agenda setting and epidemiology to model factors that shape the speed and scope of public policy diffusion. Drawing on a data set of more than 130 policy innovations, the research demonstrates that the 'laboratories of democracy' metaphor for incremental policy evaluation and emulation is insufficient to capture the dynamic process of policy diffusion in America. A significant subset of innovations trigger outbreaks - the extremely rapid adoption of innovation across states. The book demonstrates how variation in the characteristics of policies, the political and institutional traits of states, and differences among interest group carriers interact to produce distinct patterns of policy diffusion.

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This book explores the international diffusion of Participatory Budgeting (PB), a local policy created in 1989 in Porto Alegre, Brazil, which has now spread worldwide. The book argues that the action of a group of individuals called “Ambassadors of Participation” was crucial to make PB part of the international agenda. This international dimension has been largely overlooked in the vast literature produced on participatory democracy devices. The book combines public policy analysis and the study of international relations, and makes a broad comparative study of PB, including cases from Latin America, Europe, and Sub-Saharan Africa. The book also presents a new methodology developed to examine PB diffusion, the “transnational political ethnography”, which combines in-depth interviews, participant observation and document analysis both at the local and transnational level.

Why do very different countries often emulate the same policy model? Two years after Ronald Reagan's income-tax simplification of 1986, Brazil adopted a similar reform even though it threatened to exacerbate income disparity and jeopardize state revenues. And Chile's pension privatization of the early 1980s has spread throughout Latin America and beyond even though many poor countries that have privatized their social security systems, including Bolivia and El Salvador, lack some of the preconditions necessary to do so successfully. In a major step beyond conventional rational-choice accounts of policy decision-making, this book demonstrates that bounded--not full--rationality drives the spread of innovations across countries. When seeking solutions to domestic problems, decision-makers often consider foreign models, sometimes promoted by development institutions like the World Bank. But, as Kurt Weyland argues, policymakers apply inferential shortcuts at the risk of distortions and biases. Through an in-depth analysis of pension and health reform in Bolivia, Brazil, Costa Rica, El Salvador, and Peru, Weyland demonstrates that decision-makers are captivated by neat, bold, cognitively available models. And rather than thoroughly assessing the costs and benefits of external models, they draw excessively firm conclusions from limited data and overextrapolate from spurts of success or failure. Indications of initial success can thus trigger an upsurge of policy diffusion.

What are the principal drivers of recent higher education reforms? This study investigates whether the soft governance mechanism of transnational communication has evoked cross-national policy harmonization. Results suggest that the Bologna Process has triggered substantial policy harmonization beyond general policy convergence.