RANK‐ORDER COMPETITION IN THE VOLUNTARY PROVISION OF IMPURE PUBLIC GOODS

Publicly provided goods often create differential payoffs due to timely or spatial distances of group members. We design and test a provision mechanism which utilizes rank competition to mitigate free‐riding in impure public goods. In our Rank‐Order Voluntary Contribution Mechanism (Rank‐Order‐VCM) group members compete via observable contributions for a larger share of the public good; high contributors receive preferential access (a larger share), while low contributors receive restricted access (a lower share). In a laboratory experiment, Rank‐Order‐VCM elicits median contributions equal to the full endowment throughout the finitely played games with constant groups. In the control treatment, with randomly assigned ranks, the contributions are significantly lower and decline over time. We thus provide evidence of rank competition, in situations where discriminatory access to public goods is possible, being efficiency enhancing. (JEL C91, H41)     

Approximate Bayesian inference in semi-mechanistic models

Inference of interaction networks represented by systems of differential equations is a challenging problem in many scientific disciplines. In the present article, we follow a semi-mechanistic modelling approach based on gradient matching. We investigate the extent to which key factors, including the kinetic model, statistical formulation and numerical methods, impact upon performance at network reconstruction. We emphasize general lessons for computational statisticians when faced with the challenge of model selection, and we assess the accuracy of various alternative paradigms, including recent widely applicable information criteria and different numerical procedures for approximating Bayes factors. We conduct the comparative evaluation with a novel inferential pipeline that systematically disambiguates confounding factors via an ANOVA scheme.     

The Inherent Politics of Managing the Quality of Urban Green Spaces

Although the term ‘quality’ has a universal positive connotation and typically is framed by a focus on improvements, its application includes as well as excludes the access, values and world views of particular actors and interests. In this article, we highlight the relevance and implications of such ‘inherent politics’ through a case study of a widespread approach to operationalizing quality in urban green space management. We conclude that adoption of any quality model has both limiting and enabling implications for public participation and decision-making and that a critical stance is needed within both research and practice for the development of quality models that connect to values of broader societal relevance.     

Statistics

O.E. Barndorff-Nielsen, P. Blaesuld, and .s.Eriksen: Decompsition and Invariance of Measures, and Satistical Tranformation Models. Lecure Note in Statistics, No. 58, Springer-Verlag, New York, Berlin and Heidelberg 989, 147 pp., ISBN 0-387-7131-9 and 3-540-97131-9, DM 36,-.     

Telling the other what one knows? Strategic lying in a modified acquiring-a-company experiment with two-sided private information

Theory and Decision - Lying for a strategic advantage is to be expected in commercial interactions. But would this be more or less obvious when lying could come from either party and question...     

Partitioning large signed two-mode networks: Problems and prospects

While a substantial amount of attention within social network analysis (SNA) has been given to the study of one-mode networks, there is an increasing consideration of two-mode networks. Recent research on signed networks resulted in the relaxed structural balance (RSB) approach and its subsequent extension to signed two-mode networks involving social actors and social objects. We extend this approach to large signed two-mode networks, and address the methodological issues that arise. We develop tools to partition these types of networks and compare them with other approaches using a recently collected dataset of United Nations General Assembly roll call votes. Although our primary purpose is methodological, we take the first step towards bridging Heider's structural balance theory with recent theorizing in international relations on soft balancing of power processes.     

The Changing Role of the Labour Market within the EMU: the Case of Slovenia

The paper conceptualizes changes in the labour market and suggests labour market policies/reforms after Slovenia has joined the European Monetary Union. The loss of monetary sovereignty implies that in case of an external shock the labour market is burdened by a large amount of the adjustment process. But to increase flexibility of the labour market requires politically unpopular reforms. At the moment, Slovenia is faced with high inflation and a rigid labour market, which is also a key element of its low competitiveness. The reforms were halted under the pressure of their unpopularity. The paper, although concentrating on Slovenia, has general implications since the experiences of the newcomer to EMU are significant for other transition economies which are expected to follow the same path.

Partitioning signed social networks

Structural balance theory has proven useful for delineating the blockmodel structure of signed social networks. Even so, most of the observed signed networks are not perfectly balanced. One possibility for this is that in examining the dynamics underlying the generation of signed social networks, insufficient attention has been given to other processes and features of signed networks. These include: actors who have positive ties to pairs of actors linked by a negative relation or who belong to two mutually hostile subgroups; some actors that are viewed positively across the network despite the presence of negative ties and subsets of actors with negative ties towards each other. We suggest that instead viewing these situations as violations of structural balance, they can be seen as belonging to other relevant processes we call mediation, differential popularity and internal subgroup hostility. Formalizing these ideas leads to the relaxed structural balance blockmodel as a proper generalization of structural balance blockmodels. Some formal properties concerning the relation between these two models are presented along with the properties of the fitting method proposed for the new blockmodel type. The new method is applied to four empirical data sets where improved fits with more nuanced interpretations are obtained.