This paper investigates the roots of policymaking autonomy vis-à -vis international capital markets in developing nations. We do so by decomposing the elements of âpolitical risk,â and by theorizing about the implications of different components of risk for government policymaking. Political risk enters prominently in the study of economics and political science; it has been associated with outcomes including stock returns, capital flight, exchange rates, sovereign borrowing, and foreign direct investment flows. In general, where political risk is greater, investors will demand higher risk premiums, or they will refrain from investment. Nations with greater political risk therefore attract less capital or pay higher borrowing costs. As a result, political risk is a critical mechanism through which global economic forces shape domestic political outcomes.Yet, our understanding of political risk and its implications remains incomplete. Specifically, it is unclear whether market responses to political phenomena are driven by risk per se, or whether market responses are shaped more powerfully by uncertainty about the future actions of unknown political leaders. This distinction is crucial for understanding the scope and nature of market constraints on government action, and for understanding the causal linkages between globalization and domestic policymaking. We conjecture that the partisan identity of the government and the nature of political institutions will provide important signals to owners of financial capital about the risk type of the government. For governments of the left, however, we expect greater uncertainty surrounding the partisan signal of government credibility, given the disparities in market-oriented policy discipline adopted by left-leaning governments. Such uncertainty should not be as great where governments of the right are concerned. Thus, we expect sovereign debt markets to reflect such uncertainty about the government risk type in higher premiums charged to sovereign borrowers where left-leaning executives take power, compared to elections of right-wing executives.We test our propositions using both a large-N analysis of differences in interest rate spreads on government debt, a key indicator of political risk across emerging market countries over time, and by conducting case and interview research for Brazil. In the case study, we examine market responses (risk premiums) to the presidential campaign of Luiz Inácio Lula da Silva during the 2002 presidential election campaign, and compare these to data gathered in mid-2006 as Lula campaigned for re-election. As additional evidence, we draw upon interviews with professional fund managers in London and in São Paulo in mid-2006 and compare and contrast the information used to evaluate the âpolitical riskâ associated with the Lula government. ..PAT.-Unpublished Manuscript [ABSTRACT FROM AUTHOR]