Écart de chômage Canada/Etats-Unis : une explication par le prix mondial des matières premières.

Rapport de recherche

Essais sur les logiciels libres : licences doubles, effets de réseau, et concurrence

This thesis examines the microeconomic consequences of the arrival of open source in the software market. Specifically, it analyzes three features of open source software by using specific models of industrial organization. Open source software is free, and may be modified or duplicated by anyone. The first paper studies the entry of an open source software in a closed source software market. Using a model of horizontal differentiation, the analysis considers a closed source firm's investment in the quality of its software. The introduction of open source on the market reduces the firm's investment in quality and increases the price of its software. Moreover, the entry of open source software may reduce consumer welfare. Post-entry by an open source software, the reduction in market share lowers the firm's incentive to invest in quality. The second paper features vertical differentiation to study a monopolist selling supporting product to its software. The study begins by contrasting the supply of support by an open source provider and a closed source vendor. The model shows that in both cases the levels of support offered are the same. In addition, consumer welfare is higher and profit lower under an open source software. Then, the paper considers the competition in the provision of support. Here, the supply of high level support is greater than under a monopolist. Finally, the monopolist adopts a dual licensing strategy to extract more surplus from developers interested in modifying open source software and redistributing the resulting product. This technique, when the developers place high value on the source code, generates more profit if the monopolist chooses to publish as open source rather than closed source. The last paper studies how a closed source firm is affected by the introduction of an open source benefiting from contributions by users. A vertical differentiation model is used, and reveals that, when contribution of users is present, the closed source vendor may lower its price to a level where it forces the open source out of the market. The firm's lower price not only increases demand for its software, but also induces consumers into switching from open to closed source software therefore reducing the contribution of users.

[Le cheval de course Flowershop monté par le jockey Mac Gee, gagnant du prix de Diane, se tenant exceptionnellement à Lonchamp le 6/6/20] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59578

[Hippodrome d'Auteuil, 25/6/20] Héros XII [monté par le jockey G. Mitchell], gagnant du prix des Drags : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 59853

Deauville, 15/8/20, [le cheval de course] Tullamore gagnant du grand prix [monté par le jockey Jennings] : [photographie de presse] / [Agence Rol]

Référence bibliographique : Rol, 60543

« Extrait de l'amortissement general fait par le roy François I, roy de France, des biens des ecclesiastiques non amortis, sceans et scituez ez dioceses de Sens, Chartres, Orleans et Meaux, moyennant le prix et somme pour lesd. quatre diocezes de 63,000 livres tournois, sçavoir pour le dioceze de Sens 20,000, pour celuy de Chartres 24,000, pour celluy d'Orleans 12,000 et pour celluy de Meaux 7,000 », contenant seulement « une Declaration tirée de la chambre des comptes de Paris, du revenu, terres et heritages de l'abbaye du Pont aux Dames, qui fut taxée, pour sa part et cotization, à la somme de 120 livres, etc., led. amortissement fait le 3 septembre 1522 ». (Fol. 4).

Contient : Ce premier extrait est suivi de la « coppie de tiltres et admortissemens de l'eglise et abbaye N. D. du Pont aux Dames, de l'ordre de Cisteaulx, ou diocese de Meauls en Brye, faicte par l'ordonnance du roy, en l'an 1547 »