War and Natural Resource Exploitation

We build a theoretical framework that allows for endogenous conflict behaviour (i.e., fighting efforts) and for endogenous natural resource exploitation (i.e., speed, ownership, and investments). While depletion is spread in a balanced Hotelling fashion during peace, the presence of conflict creates incentives for rapacious extraction, as this lowers the stakes of future contest. This voracious extraction depresses total oil revenue, especially if world oil demand is relatively elastic and the government's weapon advantage is weak. Some of these political distortions can be overcome by bribing rebels or by government investment in weapons. The shadow of conflict can also make less efficient nationalized oil extraction more attractive than private extraction, as insecure property rights create a holdup problem for the private firm and lead to a lower license fee. Furthermore, the government fights less intensely than the rebels under private exploitation, which leads to more government turnover. Without credible commitment to future fighting efforts, private oil depletion is only lucrative if the government's non-oil office rents are large and weaponry powerful, which guarantees the government a stronger grip on office and makes the holdup problem less severe.

A cross-cultural shortened form of the ZKPQ (ZKPQ-50-CC) adapted to English, French, German, and Spanish languages.

The aim of the present study was to develop a short form of the Zuckerman-Kuhlman Personality Questionnaire (ZKPQ) with acceptable psychometric properties in four languages: English (United States), French (Switzerland), German (Germany), and Spanish (Spain). The total sample (N = 4,621) was randomly divided into calibration and validation samples. An exploratory factor analysis was conducted in the calibration sample. Eighty items, with loadings equal or higher than 0.30 on their own factor and lower on the remaining factors, were retained. A confirmatory factor analysis was performed over the survival items in the validation sample in order to select the best 10 items for each scale. This short version (named ZKPQ-50-CC) presents psychometric properties strongly similar to the original version in the four countries. Moreover, the factor structure are near equivalent across the four countries since the congruence indices were all higher than 0.90. It is concluded that the ZKPQ-50-CC presented a high cross-language replicability, and it could be an useful questionnaire that may be used for personality research.

Adaptation en français et en allemand d'une échelle de pression des pairs pour jeunes adultes : le Peer Pressure Inventory [Adaptation of a peer pressure scale in French and German: the Peer Pressure Inventory].

BACKGROUND: Peer pressure is regarded as an important determinant of substance use, sexual behavior and juvenile delinquency. However, few peer pressure scales are validated, especially in French or German. Little is known about the factor structure of such scales or the kind of scale needed: some scales takes into account both peer pressure to do and peer pressure not to do, while others consider only peer pressure to do. The aim of the present study was to adapt French and German versions of the Peer Pressure Inventory, which is one of the most widely used scales in this field. We considered its factor structure and concurrent validity. METHODS: Five thousand eight hundred and sixty-seven young Swiss men filled in a questionnaire on peer pressure, substance use, and other variables (conformity, involvement) in a cohort study. RESULTS: We identified a four-factor structure, with the three factors of the initial Peer Pressure Inventory (involvement, conformity, misconduct) and adding a new one (relationship with girls). A non-valued scale (from no peer pressure to peer pressure to do only) showed stronger psychometric qualities than a valued scale (from peer pressure not to do to peer pressure to do). Concurrent validity was also good. Each behavior or attitude was significantly associated with peer pressure. CONCLUSION: Peer pressure seems to be a multidimensional concept. In this study, peer pressure to do showed the strongest influence on participants. Indeed, peer pressure not to do did not add anything useful. Only peer pressure to do affected young Swiss men's behaviors and attitudes and was reliable.

War Signals: A Theory of Trade, Trust and Conflict

We construct a dynamic theory of civil conflict hinging on inter-ethnic trust and trade. The model economy is inhabitated by two ethnic groups. Inter-ethnic trade requires imperfectly observed bilateral investments and one group has to form beliefs on the average propensity to trade of the other group. Since conflict disrupts trade, the onset of a conflict signals that the aggressor has a low propensity to trade. Agents observe the history of conflicts and update their beliefs over time, transmitting them to the next generation. The theory bears a set of testable predictions. First, war is a stochastic process whose frequency depends on the state of endogenous beliefs. Second, the probability of future conflicts increases after each conflict episode. Third, "accidental" conflicts that do not reflect economic fundamentals can lead to a permanent breakdown of trust, plunging a society into a vicious cycle of recurrent conflicts (a war trap). The incidence of conflict can be reduced by policies abating cultural barriers, fostering inter-ethnic trade and human capital, and shifting beliefs. Coercive peace policies such as peacekeeping forces or externally imposed regime changes have instead no persistent effects.

Prescribing practices in German and Swiss psychiatric university and in non-university hospitals : national differences

RÉSUMÉ Il existe dans la pratique de prescription des médicaments de grandes variations entre les hôpitaux. Ces variations sont d'origines multifactorielles, comme par exemple des traditions de prescriptions locales, des considérations pharmato-économiques, la disponibilité d'un médicament, des différences de population, la prévalence d'une maladie, etc. Les études disponibles sur les pratiques de prescription sont souvent réduites à un centre unique, à une région ou à un pays. L'emploi de méthodes et de définitions particulières a jusqu'à pressent limité des comparaisons plus étendues entre les pays et régions. Le but de cette étude est de comparer la pratique de prescription de nouveaux médicaments psychotropes dans des cliniques suisses et allemandes. Cinq hôpitaux psychiatriques ont été sélectionnés, faisant tous partie du projet AMSP, et représentant des cliniques suisses, allemandes, de niveau universitaire ou non. Des données sur 572 patients et 1745 prescriptions ont été collectées durant un jour précis. Les comparaisons ont été ajustées pour l'âge et le sexe. Une différence significative (p <0.001) a été trouvée dans la prescription de nouveaux médicaments antidépresseurs, les cliniciens suisses en donnant en moyenne plus (65.2%) que les allemands (48.3%). Aucune différence significative n'a été démontrée dans la prescription des nouveaux médicaments antipsychotiques atypiques. Il semble en conséquence que les psychiatres suisses ont une propension plus élevée à prescrire des nouveaux médicaments antidépresseurs. Cela semble être dû à des différences de traditions de prescriptions nationales ou régionales. D'autres études sont nécessaires pour investiguer les influences économiques sur la pratique de prescription dans des cliniques suisses et allemandes. SUMMARY Obiective: There are great variations between hospitals in the way drugs are prescribed and these variations may be due to multiple factors such as local prescribing traditions, pharmacoeconomic considerations, drug availability; regional differences of population, disease prevalence etc. Available studies on prescribing habits have, besides studies performed in a unique centre, until now often been restricted to single countries or regions and the comparisons across countries or regions have often been limited by the use of diverse methodologies and definitions. The aim of the present study was to compare drug prescriptions between German and Swiss psychiatric services with regard to their preference of newer psychotropics. Material, method: Five psychiatric hospitals, associated to the AMSP-project, were chosen to represent Swiss and German clinics, university and non-university settings. Data were available from one index day on 572 patients and 1745 prescriptions. The comparisons were adjusted for age and gender. Results: There was a significant difference (p < 0.001) with regard to the prescription of newer antidepressants (NAD), Swiss clinicians giving proportionally more (65.2 %) than the German psychiatrists (48.3 %). No significant difference was, on the other hand, found as to the proportion of atypical antipsychotics, the lack of difference being due to the higher proportion of clozapine among the atypical antipsychotics in Germany. Conclusion: There seems therefore to be a higher propensity for Swiss hospital psychiatrists to prescribe newer antidepressants. This seems to be due to national or regional prescribing traditions. Further studies are needed to investigate the economical influences on antidepressant prescribing in Swiss and German clinics.)

Worker policing in the german wasp Vespula germanica

In some ants, bees, and wasps, workers kill or "police" male eggs laid by other workers in order to maintain the reproductive primacy of the queen. Kin selection theory predicts that multiple mating by the queen is one factor that can selectively favor worker policing. This is because when the queen is mated to multiple males, workers are more closely related to the queen's sons than to the sons of other workers. Earlier work has suggested that reproductive patterns in the German wasp Vespula germanica may contradict this theory, because in some colonies a large fraction of the adult males were inferred to be the workers' sons, despite the effective queen mating frequency being greater than 2 (2.4). In the present study, we reexamine the V. germanica case and show that it does support the theory. First, genetic analysis confirms that the effective queen mating frequency is high, 2.9, resulting in workers being more related to the queen's sons than to other workers' sons. Second, behavioral assays show that worker-laid eggs are effectively killed by other workers, despite worker-laid eggs having the same intrinsic viability as queen-laid ones. Finally, we estimate that approximately 58.4% of the male eggs but only 0.44% of the adult males are worker derived in queenright colonies, consistent with worker reproduction being effectively policed.