Balancing theory with evidence, in which we form and adjust our theories at least in part based on their performance, might seem to be a part of any social scientific enterprise. However, there are powerful epistemological tendencies, particularly in the field of international relations (IR), which lead many researchers in other directions. One is somewhat unique to IR—the role played historically by paradigms in the field. At their worst, paradigms put theory before evidence. They offer a set of core assumptions about the nature of international politics and lead their adherents to cherry pick evidence to support them. The other we find in many other social sciences besides political science and international relations—a commitment to deductive theorizing, particularly by practitioners of rational choice. Based on an instrumentalist epistemological position, deductive theory derives hypotheses from a set of assumptions that remain untested, and aims at uncovering general patterns of human behavior that are as generalizable as possible. This type of research, which rests on an instrumentalist epistemological approach, finds itself unable to follow the evidence because it is uninterested in testing its own assumptions with empirical data. When these assumptions prove faulty, it generates bad theory because its foundation is rotten.
International relations theorists have squabbled for decades over basic epistemological positions, with each side favoring a particular school in the philosophy of science that justifies their preferred approach to research. As Monteiro and Ruby have nicely argued in 2009, these disagreements cannot be resolved through argument, as each epistemological approach rests on its own set of assumptions that cannot be tested. While they are correct to argue that IR pick and choose their epistemology based on the kind of research they like to do, the viability of epistemological choices is to some degree subject to empirical testing.
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Empirical Evidence for Empirical International Relations Theorizing: Tests of Epistemological Assumptions With Data
Brian C. Rathbun
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Flood Damage Assessments: Theory and Evidence From the United States
Laura Bakkensen and Logan Blair
Flooding remains one of the globe’s most devastating natural hazards and a leading driver of natural disaster losses across many countries, including the United States. As such, a rich and growing literature aims to better understand, model, and assess flood losses. Several major theoretical and empirical themes emerge from the literature. Fundamental to the flood damage assessment literature are definitions of flood damage, including a typology of flood damage, such as direct and indirect losses. In addition, the literature theoretically and empirically assesses major determinants of flood damage including hydrological factors, measurement of the physical features in harm’s way, as well as understanding and modeling protective activities, such as flood risk mitigation and adaptation, that all co-determine the overall flood losses. From there, common methods to quantify flood damage take these factors as inputs, modeling hydrological risk, exposure, and vulnerability into quantifiable flood loss estimates through a flood damage function, and include both ex ante expected loss assessments and ex post event-specific analyses. To do so, high-quality data are key across all model steps and can be found across a variety of sources. Early 21st-century advancements in spatial data and remote sensing push the literature forward. While topics and themes apply more generally to flood damage across the globe, examples from the United States illustrate key topics. Understanding main themes and insights in this important research area is critical for researchers, policy-makers, and practitioners to better understand, utilize, and extend existing flood damage assessment literatures in order to lessen or even prevent future tragedy.
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Military Expenditures and Economic Growth
J. Paul Dunne and Nan Tian
The literature on military spending and growth has become extremely large and diverse and has reached no clear consensus. This lack of consensus should not be unexpected, because there are a number of issues that make the empirical analysis of the relationship difficult to undertake and make it difficult to identify the particular impact of military spending on growth. Some of these issues have had relatively little attention in the literature. The historical context can affect the military spending and growth relation, so there is no reason not to expect different results for different periods. There are various theoretical perspectives that can be used in any analysis and numerous channels through which military spending can affect growth, which means that studies can differ in how they specify the models. In estimating models, a range of econometric techniques have been used, which can affect the results. There also remain issues of identification that present problems for empirical analysis. The observed correlation between output and military expenditure is likely to be negative if the system is driven by strategic shocks and positive if it is driven by economic shocks. Improved military spending data and the existence of some shocks, such as the end of the Cold War, is helping in dealing with identification, but it still remains a concern. Overall, more recent studies show that, in general, it is much more likely that military spending has a negative effect on economic growth than was evident in the past. The issues involved in undertaking any empirical analysis on military spending and growth mean that the debate is likely to continue.
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Nuclear Proliferation: The Next Wave in 2020
Rupal N. Mehta and Rachel Elizabeth Whitlark
What will nuclear proliferation look like in the future? While the quest for nuclear weapons has largely quieted after the turn of the 21st century, states are still interested in acquiring nuclear technology. Nuclear latency, an earlier step on the proliferation pathway, and here defined as operational uranium enrichment or plutonium reprocessing capability, is increasingly likely to be the next phase of proliferation concern. The drivers of nuclear latency, namely security factors, including rivalries with neighboring adversaries and the existence of alliances, are especially consequential in an increasingly challenging geopolitical environment. Though poised to play a significant role in international politics moving forward, latency remains a core area of exploration and subject of debate within the nuclear weapons literature writ large. While in many ways similar to nuclear weapons’ proliferation, the pursuit of nuclear latency has distinct features that merit further attention from scholars and policymakers alike.
