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There is not, of course, a one-to-one relation between policy conclusions and the conclusions of positive economics; if there were, there would be no ... |
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What enables individually simple insects like ants to act with such precision and purpose as a group? How do trillions of individual neurons produce something as extraordinarily complex as consciousness? What is it that guides self-organizing structures like the immune system, the World Wide Web, the global economy, and the human genome? These are just a few of the fascinating and elusive questions that the science of complexity seeks to answer. In this remarkably accessible and companionable book, leading complex systems (...) |
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ABSTRACT What constitutes a Black Swan? And under what conditions may a Black Swan be expected to arise? As Nassim Taleb describes it, a Black Swan is an event that displays three key properties, the two most important of which are that: (1) it is not even imagined as a possibility prior to its occurrence; and (2) it is in some way significant in its impact. It follows that whether or not an event counts as a Black Swan depends on (...) |
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Based on more than three decades of observation, Robert Jervis concludes in this provocative book that the very foundations of many social science theories--especially those in political science--are faulty. Taking insights from complexity theory as his point of departure, the author observes that we live in a world where things are interconnected, where unintended consequences of our actions are unavoidable and unpredictable, and where the total effect of behavior is not equal to the sum of individual actions. Jervis draws on (...) |
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ABSTRACT Nassim Taleb rightly points out that although people may acknowledge in the abstract that the world is uncertain, they still behave as if a large enough sample size is all that is needed to predict, and model, the future. He also rightly notes that ever?increasing quantities of information are relevant only in simple situations, such as in predicting the range of human height, but are misleading in more random arenas, such as financial markets. However, while Taleb decries the use (...) |
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ABSTRACT We like to believe that our world is regular, that we can predict it fairly well, and that we can control the risks we run. Nassim Taleb argues that we are fooling ourselves and that the course of history is driven by rare and extreme events, which he calls Black Swans. There is much to this, but scholars—at least in political science—are less oblivious to the problem than he believes. More thought needs to be given to hard issues of (...) |
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ABSTRACT What constitutes a Black Swan? And under what conditions may a Black Swan be expected to arise? As Nassim Taleb describes it, a Black Swan is an event that displays three key properties, the two most important of which are that: (1) it is not even imagined as a possibility prior to its occurrence; and (2) it is in some way significant in its impact. It follows that whether or not an event counts as a Black Swan depends on (...) |
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Taber and Lodge's 2006 paper provides powerful evidence that one's prior beliefs shape one's reception of new evidence in a manner that can best be described as “inadvertently dogmatic.” This is especially true for people who are well informed, which dovetails with findings going back to Converse (1964) showing political beliefs to be ideologically constrained (rigid) among the relatively well informed. What may explain the coincidence of dogmatism and knowledgeability is the very process of learning about politics, which must use (...) |
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We like to believe that our world is regular, that we can predict it fairly well, and that we can control the risks we run. Nassim Taleb argues that we are fooling ourselves and that the course of history is driven by rare and extreme events, which he calls Black Swans. There is much to this, but scholars—at least in political science—are less oblivious to the problem than he believes. More thought needs to be given to hard issues of whether (...) |
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System effects often stand in the way of attempts to come up with simple explanations of politics. Systems are often characterized by nonlinearities, where an effect is more than the sum of the effects of the actions taken by multiple actors. Another system effect is feedback, where the effect of actions is to amplify the problem the actions are intended to solve. There may also be indirect effects, where an incidental aspect of an action becomes more important (to other actors) (...) |
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ABSTRACT Nassim Taleb rightly points out that although people may acknowledge in the abstract that the world is uncertain, they still behave as if a large enough sample size is all that is needed to predict, and model, the future. He also rightly notes that ever‐increasing quantities of information are relevant only in simple situations, such as in predicting the range of human height, but are misleading in more random arenas, such as financial markets. However, while Taleb decries the use (...) |
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The correct solution to complex problems, such as those involved in international relations, can generally be discovered ex post but not predicted ex ante. Economics and game theory attempt to model such complexity, but have difficulty taking into account psychological subtleties, the myriad factors that each agent considers when making a decision, and cultural differences. And understanding that one is dealing with a system—that is, with interacting factors instead of with insulated monads—may not make the questions any more amenable to (...) |
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Where Taber and Lodge view belief polarization to indicate a “partisan motivation,” Lord et al. (1979) believed it to be consistent with a desire for accuracy: A “weak” study articulating an opposing viewpoint might simply sharpen participants' initial belief of the wisdom of their prior beliefs. This polarization, Taber and Lodge show, correlates with political sophistication: The more partisan a participant, the more time spent reading the opinions of the other side—in order to critically refute them. Taber and Lodge attribute (...) |
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Robert Jervis's System Effects was published just as systems thinking began to decline among political scientists, who were adopting increasingly strict standards of causal identification, privileging experimental and large-N studies. Many politically consequential system effects are not amenable to research designs that meet these standards, yet they must nonetheless be studied if the most important questions of international politics are to be answered. For example, if nuclear weapons are considered in light of their effect on the international system as a (...) |
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Complexity science has witnessed a number of advances since the publication of Jervis's System Effects. These advances better allow us to untangle the messy elements in a system and predict sets of likely outcomes. However, just because a system is complex doesn't mean that all the ideas relating to complexity—such as agent-based modeling, path dependency, tipping points, between-class versus within-class effects, and networks—are necessarily relevant. One of our tasks is to determine whether they are—and, if so, their implications. As examples, (...) |
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