Discourse Network Analysis of Nuclear Narratives

This study combines insight from discourse network analysis (DNA) and the Narrative Policy Framework (NPF) to develop a new approach to studying narrative discourse within and across policy coalitions. The approach facilitates examination of narrative cohesion, which may impact the stability of coalitions and the impact of narrative discourse on policy change. We demonstrate the value of the approach by using it to study meta narratives on Twitter within and across groups of policy actors who support and oppose the expansion of nuclear energy in the United States. The approach reveals a variety of patterns that are unlikely to be seen using more common approaches to narrative policy analysis. Most notably, there were signs of narrative cohesion within both groups, but there were also slight fissures that may indicate strategic efforts to communicate with different constituents or fault lines that threaten group stability. These findings set the stage for future work on the relationship between narrative cohesion and policy outcomes.

Cooperative Management of Ecosystem Services: Coalition Formation, Landscape Structure and Policies

A growing body of literature shows that full-cooperation among farmers to manage productive ecosystem services would yield gains with respect to uncoordinated approaches. The public good feature of these ecosystem services may, however, hinder the emergence of a cooperative solution at the landscape scale. In this paper, we introduce in a coalition formation game a spatially-explicit bioeconomic model of fruit pollination, where pollinaton depends on the distance to the choosen location of natural habitats. We analyse: (i) which coalitions are stable; (ii) what benefits they provide; (iii) how cooperation depends on the initial landscape structure; and (iv) how policy instruments affect cooperation. The theoretical model presents the rationality of cooperation but, due to the detailed heterogeneity and complex spatial interactions among farms, we use a numerical example to determine the stable coalitions. We find that only small coalitions are stable and that the benefits of cooperation decrease when the spatial autocorrelation of fruit tree covers increase. Policy instruments can increase the interest for cooperation but per-hectare payments and minimum participation rules may reduce the habitat area at the margin (by decreasing the stability of coalitions). Price premium for the coalition members increase the habitat area but its budget-effectiveness decreases as the spatial autocorrelation of fruit tree covers increase.

Complete Versus Partial Collusion in Competing Coalitions

In this paper, we develop a non-cooperative game theoretic model for our problem context in which the competing producers adopt one of the two alternate production and marketing technologies — efficient and inefficient. We examine stability related implications of the producers' decisions regarding the choices of (i) technologies, (ii) coalition formation, (iii) coalition form, (iv) intensity of collusion. The coalitions can adopt either complete collusion or partial collusion by determining intensity of collusion using endogenously determined sharing rules. The motivation for our study comes from the Costa Rican coffee industry and interesting findings presented in the existing literature focusing on a variety of competing-coalitions settings. Our results can be categorized as: (i) Nash equilibrium of the endogenously determined sharing rules, (ii) the equilibrium coalition forms, and (iii) stability of coalitions. They highlight the dynamics between the number of coalition producers and the cost of inefficiency. We show that the equilibrium sharing rules may have interior solutions and they are not necessarily (a)symmetric. We also show that both coalitions forming complete collusion of the respective producers in not always a Nash equilibrium, and the equilibrium coalition forms need not be (a)symmetric. Our main contribution to existing literature rests in determining the situations in which (i) competing players form coalitions, and (ii) they adopt the coalition form of either complete or partial collusion. Moreover, we provide an alternate explanation to why competing producers horizontally merge in the presence of a competing coalition adopting partial collusion in spite of the merger paradox. We also show that none of the two types of producers considered in this paper have any incentives in not making the information on their coalition form public. Moreover, we establish that situations yielding stable coalitions always exist. Our results demonstrate that the cost advantage to the efficient producers decreases in the number of producers adopting the efficient technology, and the coalition stability related conditions need not imply better profitability for one type of producer vis-à-vis the other. Our model essentially provides a platform for future research in a variety of competing-coalitions settings adopting endogenously determined sharing rules.

The Stability of Coalitions on Roll Calls in the House of Representatives

In some recent discussions of roll calls in Congress a model of interacting blocs has often been adopted and to a considerable degree verified. This model assumes the existence of several fairly cohesive blocs along with, perhaps, some unattached members. Furthermore, it is assumed that some of these blocs are fairly consistently opposed on roll calls, while others ally now with one side, now with the other. This model is attractive, not only because it accords with the usage of journalists, but also because it seems to provide a rational explanation of what sometimes appears to be the almost random confusion of Congressional voting behavior. As the evidence here presented suggests, however, this model is somewhat too neat and requires modification to account for shifting alliances over (often relatively short periods of) time. In a trial, reasoning from the assumptions of this model, we attempted to pick out those blocs and members who shifted from side to side. We were, however, unable to do so except in a few instances, largely, we believe, because the model as heretofore developed is static.