México, and the United States; their mutual relations and common interests 7

UANL

Upper Semicontinuous Extensions of Binary Relations.

Suzumura shows that a binary relation has a weak order extension if and only if it is consistent. However, consistency is demonstrably not sufficient to extend an upper semi-continuous binary relation to an upper semicontinuous weak order. Jaffray proves that any asymmetric (or reflexive), transitive and upper semicontinuous binary relation has an upper semicontinuous strict (or weak) order extension. We provide sufficient conditions for existence of upper semicontinuous extensions of consistence rather than transitive relations. For asymmetric relations, consistency and upper semicontinuity suffice. For more general relations, we prove one theorem using a further consistency property and another with an additional continuity requirement.

Estimating the Tobit Model with Serial Correlation: an Operational Approach

Several Authors Have Discussed Recently the Limited Dependent Variable Regression Model with Serial Correlation Between Residuals. the Pseudo-Maximum Likelihood Estimators Obtained by Ignoring Serial Correlation Altogether, Have Been Shown to Be Consistent. We Present Alternative Pseudo-Maximum Likelihood Estimators Which Are Obtained by Ignoring Serial Correlation Only Selectively. Monte Carlo Experiments on a Model with First Order Serial Correlation Suggest That Our Alternative Estimators Have Substantially Lower Mean-Squared Errors in Medium Size and Small Samples, Especially When the Serial Correlation Coefficient Is High. the Same Experiments Also Suggest That the True Level of the Confidence Intervals Established with Our Estimators by Assuming Asymptotic Normality, Is Somewhat Lower Than the Intended Level. Although the Paper Focuses on Models with Only First Order Serial Correlation, the Generalization of the Proposed Approach to Serial Correlation of Higher Order Is Also Discussed Briefly.

Consistent Relations

Consistency, a natural weakening of transitivity introduced in a seminal contribution by Suzumura (1976b), has turned out to be an interesting and promising concept in a variety of areas within economic theory. This paper summarizes its recent applications and provides some new observations in welfarist social choice and in population ethics. In particular, it is shown that the conclusion of the welfarism theorem remains true if transitivity is replaced by consistency and that an impossibility result in variable-population social-choice theory turns into a possibility if transitivity is weakened to consistency.

Les relations verticales gerees par des contrats, etude theorique et application au contrat d'electricite entre Norsk-Hydro Canada Inc. et Hydro Quebec..

Rapport de recherche

Annales de Domingo Francisco de San Anton Chimalpahin Cuauhtlehuanitzin, sixieme et septieme relations (1258-1612)

UANL

La dimension juridique des relations entre Samuel de Champlain et les Autochtones de la Nouvelle-France

Contrairement à ce qui s’est produit dans les colonies espagnoles, en Nouvelle-Fance, les Français ont privilégié le maintien de relations pacifiques avec les peuples autochtones. Même si les représentants de la couronne sont autorisés à les assujettir par la force, très rapidement, le roi exige le respect des traités conclus avec eux. Ces alliances constituent d’ailleurs la première étape d’un processus de sédentarisation et de conversion qui doit, dans l’esprit des autorités, culminer par l’assujettissement des Autochtones à la couronne. Pour l’heure, au début du XVIIe siècle, ils sont considérés comme des alliés vivant selon leurs propres coutumes. C’est pourquoi Champlain doit renoncer à appliquer le droit français dans les cas où un Français a été tué par un Autochtone, alors qu’il n’envisage même pas d’imposer ces règles quand les protagonistes sont tous autochtones.