Review of Politics in Time, by Paul Pierson
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book reviews 283 According to Gerring, ‘‘each case may provide a Politics in Time: History, Institutions, and Social single observation or multiple (within-case) observa- Analysis. By Paul Pierson. (Princeton University tions (19) ...For those familiar with the rectangular Press, 2004.) form of a dataset [i.e., a data matrix], it may be helpful doi:10.1017/S0022381607080280 to conceptualize observations as rows, variables as columns, and cases as either groups of observations or In Politics in Time, Paul Pierson has written an individual observations’’ (22). Gerring then advises the important book that is engaging, ambitious, and use of experimental or quasi-experimental methods to provocative. Its purpose is essentially threefold: to analyze variation across within-case observations. Yet advocate that political scientists situate arguments in for practitioners of case studies, the advice seems temporal perspective, to illustrate a number of ways problematic; as more and more observations are in which they might do so, and to argue that much of compared, and the inferential leverage afforded by the discipline does not presently take time seriously experimental or quasi-experimental methods is enough. The book is oriented not merely toward brought to bear, it seems less likely that one is really qualitative scholars or historical institutionalists, but conducting a case study—that is, an intensive analysis rather ‘‘those interested in the attempt to develop of one or several instances of a phenomenon (19–20). claims about the social world that can potentially The concluding chapter on process tracing, co- reach across space and time’’ (7)—effectively all authored with Craig Thomas, seems to come closest social scientists who seek to advance generalizable to shedding light on the distinctive contributions of explanations. In his effort to reach such a broad case-study research to causal inference. In process audience, Pierson engages widely with the discipline tracing, not-strictly comparable pieces of information and beyond, drawing upon theoretical insights from are combined in a way that adds up to a convincing Kenneth Arrow to Arthur Stinchcombe, exploring causal account, by rendering alternative explanations causal mechanisms from positive feedback to absorb- less plausible while showing that microevidence is ing Markov chains, and offering substantive examples consistent with theoretical claims. Process tracing from U.S. congressional committees to state building may be akin to detective work; bits of evidence about in early modern Europe. the maid, the butler, and the suspect are combined The publication of Pierson’s book in 2004 oc- to formulate or investigate a central hypothesis curred in the midst of a still-ongoing resurgence of about who committed a crime. In a different but interest in qualitative methods and temporal argu- related account, Collier, Brady, and Seawright (in ments—stimulated in no small part by Pierson’s Rethinking Social Inquiry, 2004) describe how what American Political Science Review article on path they term causal-process observations can provide a dependence published in 2000. Following an initial smoking gun that demonstrates—or rules out—a series of articles on the sources of institutional lock- particular causal hypothesis. Unfortunately, the dis- in, a second wave of scholarship by authors such as cussion of process tracing is a relatively short Kathleen Thelen and Jacob Hacker shifted the focus addendum to the core concerns of Gerring’s book. to ways in which institutions change rather than Definitional slippages are one distracting feature remain stable over time. Politics in Time, which of this book, despite the inclusion of a glossary and presents revised versions of four previously published careful attention to defining terms. At one point, for articles as well as an entirely new introduction, fifth instance, Gerring notes parenthetically, ‘‘I use the chapter, and conclusion, plays the very useful role of terms proposition, hypothesis, inference, and argu- encapsulating this evolution of the literature and also ment interchangeably’’ (22). Nevertheless, articulat- offering an attempt at synthesis. Ultimately, as ing the distinctive contributions to social science of Pierson argues in Chapter 5, change and continuity case studies has been a core challenge for qualitative must be seen as two sides of the same coin. methodologists, and together with other recent con- Politics in Time begins with a focus on institu- tributions in this area (Brady and Collier, Rethinking tional continuity via path dependence and positive Social Inquiry, 2004; George and Bennett, Case Studies feedback. Examining the mechanisms that sustain and Theory Development, 2005) Gerring’s volume stability over time in economic history, Pierson argues takes on this challenge in a spirited fashion. It will that such processes should be at least as common in provide useful and engaging reading for substantive the political realm. Reasons include the prevalence of researchers of all methodological stripes. collective action in politics; the potentially self- reinforcing accumulation of power asymmetries; the Thad Dunning, Yale University absence of a price mechanism to clearly indicate 284 book reviews optimal behavior; and the centrality of formal in- argument Pierson develops in the fourth chapter. stitutions, which have large set-up costs and generate Here, Politics in Time takes aim at ‘‘actor-centered learning effects, coordination effects, and adaptive functionalism’’—the rational-choice claim that insti- expectations. When political actors begin to travel tutions exist because farsighted, purposive, and in- down a self-reinforcing path—even one that is strumental actors benefit from them. Drawing upon eventually considered inferior to the road not tak- numerous empirical examples, Pierson lays out six en—reversal is unlikely because of the short time limitations to this perspective. Institutions may have horizons of many political actors and the obstacles to multiple or unanticipated effects, such that their change built into many political institutions. existence cannot be explained by a simple reading Having established the importance of positive of their creators’ preferences. Designers also may feedback mechanisms, the second chapter of Pier- adopt institutional forms for noninstrumental reasons, son’s book examines the closely related issue of such as diffusion or cultural specificity. Actors may timing and sequence. Here, he advocates an approach have short time horizons, creating institutions with that combines the insights and precision of rational undesirable long-term effects, or their preferences may choice models of legislative cycling with the attention change over time as institutions remain stable. Finally, to large-scale social changes that have been the political actors themselves may change; a new gener- mainstay of historical institutionalism and American ation may inherit institutions that reflect previous political development. Sequencing arguments, he actors’ preferences rather than their own. maintains, need not be ‘‘Dr. Seuss-style,’’ ad hoc In recognition of these limitations to the rational explanations in which it ‘‘just so happened’’ that one choice perspective, many historical and sociological event followed another. Rather, the best of these institutionalists have begun to articulate mechanisms arguments illustrate, often via comparison, how the of how institutions change over time. Yet in Chapter order of particular events matters crucially for the 5, Pierson argues that shifting from an assumption of eventual outcome. Examples include the self-rein- static institutions to an exclusive focus on fluidity forcing incumbency advantages enjoyed by a party involves too much of a swing of the pendulum. that initially ‘‘fills up’’ a political space, such as by Research on institutional change, which has identi- organizing the working class. Future competitors for fied mechanisms such as critical junctures, layering, this constituency will have greater difficulty than if conversion, and diffusion, places undue emphasis on they had been the first ones to occupy the same the malleability of institutions at the hands of political niche. entrepreneurs or the losers from previous rounds of The third chapter of Pierson’s book shifts the political competition, and it does not predict when focus from arguments emphasizing continuity to we should expect one type of institutional change those that focus on long-term change. Many topics versus another. Most importantly, arguments about in political science, Pierson argues, are those in which institutional change often lose sight of the sources of cause immediately precedes effect and both occur institutional stability, such as coordination problems, relatively quickly. The tendency to limit time hori- veto points, asset specificity, and positive feedback. zons of research topics in this fashion, however, Thus, Pierson concludes by proposing five distinct ignores a number of important processes, such as research agendas on processes of institutional devel- cumulative causes, threshold effects, and causal opment that seek a synthesis between arguments chains, in which the cause or the outcome unfolds about change and continuity. over a significant period of time or there is sub- As mentioned at the outset, the objective of stantial temporal separation between the two. Pierson Pierson’s book is not only to illustrate ways in which argues that the trend toward