Far-sighted equilibria in 2 × 2, non-cooperative,repeated games

Consider a two-person simultaneous-move game in strategic form. Suppose this game is played over and over at discrete points in time. Suppose, furthermore, that communication is not possible, but nevertheless we observe some regularity in the sequence of outcomes. The aim of this paper is to provide an explanation for the question why such regularity might persist for many (i.e., infinite) periods.Each player, when contemplating a deviation, considers a sequential-move game, roughly speaking of the following form: if I change my strategy this period, then in the next my opponent will take his strategy b and afterwards I can switch to my strategy a, but then I am worse off since at that outcome my opponent has no incentive to change anymore, whatever I do. Theoretically, however, there is no end to such reaction chains. In case that deviating by some player gives him less utility in the long run than before deviation, we say that the original regular sequence of outcomes is far-sighted stable for that player. It is a far-sighted equilibrium if it is far-sighted stable for both players.     

The birth of the queen/the modern homosexual: historical explanations revisited

In this paper I review a number of explanations for the emergence of the modern homosexual category in Western (mainly Northwest European) cultures. I suggest there are four different emphases in respect of the social and cultural factors given priority in interpretations of the formation of the homosexual category. Of course, individual studies have often taken into consideration more than one single factor (most notably, Greenberg, 1988; Chauncey, 1994), and the grouping of previous studies that I here suggest only indicates where the focus of a given study is. The social and cultural factors emphasized in these four approaches are: 1) the effects of competitive capitalism on the bourgeois/middle class political economy of sexuality and sexual morals; 2) the rise of expert knowledges, controlling systems, and modern bureaucracies; 3) tensions within gender order and the struggle over new definitions of gender roles; 4) the rise of free wage labour, the proliferation of urban anonymity, and the unfolding of new modes of existence in the life-world of modern pluralist urban society. Finally, the article briefly considers the potential erosion of the homosexual vs. heterosexual divide in the light of the historical background. Almost thirty years have passed since ‘The Homosexual Role’, by Mary McIntosh (1968), the first notable contribution to the historical sociology of homosexuality operating within a social constructionist view of homosexuality. Since then, there have been numerous studies of the formation of the conceptual category and social aggregate of ‘modern homosexual’. Researchers have differed about whether the pedigree of ‘homosexual’ and homosexual identities and subcultures in Western societies can be traced back to the late nineteenth century or to the early eighteenth century, and whether or not some notion of ‘homosexual’ was established in the cultural imagery before the last fifty years or so. It might be fruitful to distinguish between the historically older categories of ‘molly’, ‘queen’, and ‘fairy’ on the one hand, and the more recent ‘homosexual’ on the other hand. It can be argued that the decisive feature of the first-mentioned ‘deviant men’ was their status as gender-crossers (which as a side-effect entailed an interest in homosexual conduct), whereas the modern term homosexual does not necessarily suggest gender-crossing or more generic ‘sexual inversion’(cf. Chauncey, 1994). However, allusions to gay men's purported effeminacy and lesbian women's purported masculinity continue to surface frequently also in contemporary culture. Hence, for the sake of brevity, I here use the term modern homosexual, by which I refer to a notion that there is in some people an inherent sexual desire exclusively for persons of the same sex, and that this so-called sexual orientation is to some degree intertwined with a tendency to gender-crossing conduct. ¹ 1 Historically there has been a mutually re-enforcing dynamics between the forma-tion of the conceptual category and the social aggregate of homosexual(s). Methodological considerations and also certain presumptions about the dynam-ics of culture and society help explain why, until recently, most studies have focused on the trajectory of concepts, identities, and social roles, rather than on the experiential, embodied aspects of the social aggregate of homosexual(s). The idea of sexual inversion predicates that homosexual desire is evidence of a faulty combination of body and soul: there is ‘a female soul in a male body’, or vice versa. On the distinctions between sexual orientation and sexual role see, King, 1984.
     

Horses and baseball: social work’s cultivation of one’s ‘third eye’

Active self-reflection is a sophisticated and subtle, multi-layered process that requires learning the capacity to constantly self-monitor. These fundamental interactive skills, the core of a competent social worker, are important to work in any context. Using two distinct metaphors, one relating to horses, the other to baseball, the article will explore the importance of developing competency skills and utilize a ‘third eye.’ In current social work education curricula the use of self may not be prioritized, practiced, or well understood. Evidence from human and veterinary medicine as well as social work, are discussed. An example of an undergraduate BSW course using simulated clients and standardized measures is discussed. The paper includes a brief review of the preliminary findings for a small pilot study and the relevance to future research is considered.     

Scanner Data and the Treatment of Quality Change in Nonrevisable Price Indexes

The recently developed rolling year GEKS procedure makes maximum use of all matches in the data to construct nonrevisable price indexes that are approximately free from chain drift. A potential weakness is that unmatched items are ignored. In this article we use imputation Törnqvist price indexes as inputs into the rolling year GEKS procedure. These indexes account for quality changes by imputing the “missing prices” associated with new and disappearing items. Three imputation methods are discussed. The first method makes explicit imputations using a hedonic regression model which is estimated for each time period. The other two methods make implicit imputations; they are based on time dummy hedonic and time-product dummy regression models and are estimated on bilateral pooled data. We present empirical evidence for New Zealand from scanner data on eight consumer electronics products and find that accounting for quality change can make a substantial difference.     

RISK AVERSION AND OVERBIDDING IN FIRST PRICE SEALED BID AUCTIONS: NEW EXPERIMENTAL EVIDENCE

Bidding above the risk‐neutral Nash equilibrium in first price sealed bid auctions has traditionally been ascribed to risk aversion. Later studies, however, offer other explanations and even argue that risk aversion plays no or a minor role. In a novel experimental design, we directly test the relationship between risk aversion and overbidding by systematically varying the distribution of risk attitudes in auction markets. We find a significant relationship between our measure of risk aversion and overbidding. (JEL D44, C91)     

On regression modelling with dummy variables versus separate regressions per group: Comment on Holgersson et al.

In a recent issue of this journal, Holgersson et al. [Dummy variables vs. category-wise models, J. Appl. Stat. 41(2) (2014), pp. 233–241, doi:10.1080/02664763.2013.838665] compared the use of dummy coding in regression analysis to the use of category-wise models (i.e. estimating separate regression models for each group) with respect to estimating and testing group differences in intercept and in slope. They presented three objections against the use of dummy variables in a single regression equation, which could be overcome by the category-wise approach. In this note, I first comment on each of these three objections and next draw attention to some other issues in comparing these two approaches. This commentary further clarifies the differences and similarities between dummy variable and category-wise approaches.     

An experimental investigation of risk sharing and adverse selection

Does adverse selection hamper the effectiveness of voluntary risk sharing? How do differences in risk profiles affect adverse selection? We experimentally investigate individuals’ willingness to share risks with others. Across treatments we vary how risk profiles differ between individuals. We find strong evidence for adverse selection if individuals’ risk profiles can be ranked according to first-order stochastic dominance and only little evidence for adverse selection if risk profiles can only be ranked according to mean-preserving spreads. We observe the same pattern also for anticipated adverse selection. These results suggest that the degree to which adverse selection erodes voluntary risk sharing arrangements crucially depends on the form of risk heterogeneity.     

Promoting Ethnic Entrepreneurship in European Cities: Sometimes Ambitious,Mostly Absent,Rarely Addressing Structural Features

An increasing number of immigrants have become entrepreneurial and many governments expect or hope that the ongoing rise of ethnic entrepreneurship will contribute significantly to the integration of immigrants, to their upward mobility, and to the economic development of the city of residence. In this article we explore the rules, regulations and policy interventions that shape self‐employment trajectories in general and those of immigrant ethnic minorities in particular. The article is based on a general inventory of measures to promote ethnic entrepreneurship in 32 European countries, and a somewhat deeper inventory of policies and interventions in 28 European cities. We came across all kinds of measures and interventions and identified certain patterns, but the most striking finding was that such explicit measures and interventions were actually thin on the ground. We conclude this article with a discussion of the structural determinants of this outcome.     

Predictors of Antisocial and Prosocial Behavior in an Adolescent Sports Context

This study examined antisocial and prosocial behavior of N = 439 adolescent athletes between 14 and 17 years of age (67 teams). Multi‐level analyses showed that team membership explained 20 and 13 percent of the variance in antisocial and prosocial behavior in the sports context, respectively. The team effects suggest that aggregating antisocial or prosocial adolescents within teams may partially explain differences in antisocial and prosocial behavior among athletes in the sports context. A trend was found toward a relation between higher levels of moral reasoning within teams, and less antisocial behavior in the sports context. Favorable moral atmosphere was positively associated with more prosocial behavior in the sports context. Finally, supportive coach–athlete relationships were associated with both less antisocial and more prosocial behavior in the sports context.