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Political scientists, sociologists, and economists have all sought to analyze the spread of economic and political liberalism across countries in recent decades. This article documents this diffusion of liberal policies and politics and proposes four distinct theories to explain how the prior choices of some countries and international actors affect the subsequent behavior of others: coercion, competition, learning, and emulation. These theories are explored empirically in the symposium articles that follow. The goal of the symposium is to bring quite different and often isolated schools of thought into contact and communication with one another, and to define common metrics by which we can judge the utility of the contending approaches to diffusion across different policy domains.

Over the past forty-five years, bilateral investment treaties (BITs) have become the most important international legal mechanism for the encouragement and governance of foreign direct investment. The proliferation of BITs during the past two decades in particular has been phenomenal. These intergovernmental treaties typically grant extensive rights to foreign investors, including protection of contractual rights and the right to international arbitration in the event of an investment dispute. How can we explain the widespread adoption of BITs? We argue that the spread of BITs is driven by international competition among potential host countries-typically developing countries-for foreign direct investment. We propose a set of hypotheses that derive from such an explanation and develop a set of empirical tests that rely on network measures of economic competition as well as more indirect evidence of competitive pressures on the host to sign BITs. The evidence suggests that potential hosts are more likely to sign BITs when their competitors have done so. We find some evidence that coercion and learning play a role, but less support for cultural explanations based on emulation. Our main finding is that the diffusion of BITs is associated with competitive economic pressures among developing countries to capture a share of foreign investment. We are agnostic at this point about the benefits of this competition for development.

We examine change in the size of the public sector between 1980 and 1997 across twenty-six Organization for Economic Cooperation and Development (OECD) member nations, with particular attention to diffusion dynamics. General method of moments (GMM) analyses demonstrate imitation of shifts in government employment within the United States and mutual influence among nations that are geographically proximate and that trade extensively. Disaggregated analyses show that downsizing is contagious while upsizing is not: proximate downsizers but not upsizers are imitated, and states act on evidence that downsizing is economically beneficial while ignoring evidence that it is harmful. We argue that these asymmetries in emulation and learning are a product of the dominance of neoliberal and managerialist discourses that legitimate and theorize shrinking the public sector.

I offer an explanation for the widespread diffusion of neoliberal tax policies in the developed democracies. After accounting for the policy influences of commonly experienced domestic and international forces, I consider several plausible paths of diffusion of neoliberal tax structure. My central argument is that the highly visible 1980s market-conforming tax reform in the United States should be especially important in shaping subsequent tax policies in other polities. There are substantial reasons to believe, however, that domestic political and institutional forces will shape policy-maker assessment of the benefits and costs of neoliberal reforms: the strength of right parties and the degree to which the median voter has moved right should condition adoption of neoliberal tax policy; the institutions of national and sector-coordinated capitalism should also slow the enactment of neoliberal tax reforms. I assess these arguments with empirical models of 1981-98 tax rates on capital in sixteen nations. I find that changes in U.S. tax policy influence subsequent reforms in other polities; in the long term, all nations move toward the U.S. neoliberal tax structure. Analysis also shows, however, that the short-term responsiveness to U.S. tax reforms is notably greater where uncoordinated market institutions are dominant. Theory and extensive qualitative and quantitative evidence indicate that pressures to compete for mobile assets, as balanced against the economic and political costs of adoption, anchor the process of diffusion of neoliberal tax policy. There is little evidence for the view that systematic policy learning or social emulation drove tax policy diffusion.