Two simplified proofs for Roberts’ theorem

Roberts (Aggregation and Revelation of Preferences. Papers presented at the 1st European Summer Workshop of the Econometric Society, pp. 321–349. North-Holland, 1979) showed that every social choice function that is ex-post implementable in private value settings must be weighted VCG, i.e. it maximizes the weighted social welfare. This paper provides two simplified proofs for this. The first proof uses the same underlying key-point, but significantly simplifies the technical construction around it, thus helps to shed light on it. The second proof builds on monotonicity conditions identified by Rochet (J Math Econ 16:191–200, 1987) and Bikhchandani et al. (Econometrica 74(4):1109–1132, 2006). This proof is for a weaker statement that assumes an additional condition of “player decisiveness”. Supported by grants from the Israeli Ministry of Science and the Israeli Academy of Sciences.     

Die A-Moral der Wirtschaft und die Paradoxie ihrer Moralisierung

Following the argumentation of historico-genetic theory this contribution firstly aims to set out the societal conditions of the consitution of morality and analyse its structural limitations. In a further step it will be shown that the moralization of the economic system on the base of legally not binding CSR programs has to be considered as an innovative power strategy of the economic elites. Exemplarily this thesis will be explored on the basis of the CSR strategy of Austrian OMV AG. Why the political elites of the democratic systems in Austria and elsewhere easily can be manipulated by the logic of economy and nearly without critics accept neoliberal ideology of CSR—this question will be discussed at last.     

Zur Berücksichtigung von Heterogenit?t versus funktionaler Flexibilit?t in Absatzreaktionsmodellen: Eine empirische Studie auf Basis von Handelsdaten

In this paper, we explore the differences between store sales models that allow for heterogeneity in marketing effects across stores and models that accommodate potential irregularities in sales response through the use of nonparametric estimation techniques. In particular, we investigate the following question: What benefits can we gain from incorporating store heterogeneity versus functional flexibility in sales response models concerning fit and predictive validity, as compared to a simple parametric store sales model? In an empirical study based on store-level data, we also compare the different model versions with respect to estimated price elasticities and resulting shapes for own- and cross-price effects. Our empirical results indicate that addressing heterogeneity is not advantageous in general, as model fit, predictive validity and the accuracy of price elasticities did not improve for many brands. In contrast, estimating sales response flexibly provides much more potential for statistical improvements and leads to different implications concerning price elasticities, too.     

The dynamics of homeownership among the 50+ in Europe

We use life history data covering households in 13 European countries to analyse residential moves past the age of 50. We observe four types of moves: renting to owning, owning to renting, trading up or trading down for homeowners. We find that in the younger group (aged 50–64), trading up and purchase decisions prevail; in the older group (65+), trading down and selling are more common. Overall, moves are rare, particularly in countries characterised by high transaction costs. Most moves are driven by changes in household composition (divorce, widowhood, nest leaving by children), but economic factors play a role: low-income households who are house-rich and cash-poor are more likely to sell their home late in life.     

Similarity and Complementarity of Behavioral Profiles of Friendship Types and Types of Friends: Friendships and Psychosocial Adjustment

This study investigated different types of friendships and the behavioral profiles of different types of friends in relation to individual adjustment. In 102 classes with preadolescents (mean age 11), 737 independent friendship dyads, and in 149 classes with adolescents (mean age 14), 1,102 friendship dyads were identified. At each age group, cluster analyses on the behavioral profiles of the dyads yielded three friendship types, with two types of friends within each friendship type: Socially Withdrawn friendship (Victimized Withdrawn and Prosocial Withdrawn friends), Prosocial friendship (High Prosocial and Less Prosocial friends), and Antisocial friendship (Bullying Antisocial and Antisocial friends). The behavioral profiles of the two friends in Prosocial friendships were marked by similarity and in the other two types by complementarity. Both Victimized Withdrawn and Bullying Antisocial friends were less adjusted than participants without friends while Prosocial friends were more adjusted.     

A Mandate for Honesty: Jeff Young's No Bullshit Therapy

Jeff Young talks about having been trained to be formal with clients, and his gradual realisation that he could return to the more direct ways of speech he learned as a child, and combine that with warmth. He found that clients and fellow professionals welcomed a therapist who did not ‘beat around the bush’. Together, Jeff and Ron talk about when directness is appropriate, and how directness needs to be modified for particular clients.