Les États ouest-africains ont fait de l’intégration économique la voie privilégiée pour relever le défi du développement économique dans un contexte international de plus en plus concurrentiel. Ainsi, par le biais d’organisations régionale et sous régionale, la protection du libre jeu de la concurrence est devenue un enjeu communautaire. L’intégration économique régionale ouest-africaine a donc été saisie par le droit de la concurrence. De ce fait, on assiste à l’émergence de droits régionaux de la concurrence au sein de l’Union économique et monétaire ouest africaine (UEMOA) et de la Communauté économique des États de l’Afrique de l’Ouest (CEDEAO). Chacune de ces organisations a donc mis en place un droit de la concurrence dans son espace économique. Il en résulte, vu la composition de l’UEMOA et de la CEDEAO, que ces droits communautaires ont vocation à s’appliquer aux États membres de l’Union qui font également partie de la Communauté. Cette particularité de la coexistence de ces règles communautaires de la concurrence en Afrique de l’Ouest méritait qu’on s’y attarde afin d’évaluer leur application, d’analyser l’effectivité et l’efficacité de ces droits. Cette étude comparative s’est attachée à mettre en exergue ce que renferment ces droits, à relever leurs spécificités, tout en mettant en lumière leurs insuffisances. Il apparaît nécessaire de repenser, voire de réformer certains aspects de ces droits afin d’améliorer leurs applications, gage d’une meilleure protection de la libre concurrence en Afrique de l’Ouest. / West African states have made economic integration the preferred way to deal with the challenge of economic development in an increasingly competitive international context. Thus, through regional and subregional organizations, the protection of the free movement of competition has become a community issue.West African regional economic integration has therefore been seized by competition law. From this, we note emerging competition rights in the West African Economic and Monetary Union (WAEMU) and the Economic Community of West African States (ECOWAS). Each of these organizations has therefore put in place a competition law in its economic area. As a result, given the composition of UEMOA and ECOWAS, these Community rights are intended to be applied to the Member States of the Union which are also part of the Community. The features of the coexistence of these Community competition law in West Africa deserved to be examined in order to evaluate their application, to analyze the effectiveness and efficiency of these rights. This comparative study intends to highlight the contain of these rights, reveal their specificities, while showing their lacks. It’s necessary to rethink or even reform some aspects of these rights to improve their applications, basis for a better protection of free competition in West Africa.

This thesis examines the measurement, applications and properties of consumer inflation expectations in the context of eight European Union countries: France, Germany, the UK, Spain, Italy, Belgium, the Netherlands and Sweden. The data proceed mainly from the European Commission's Consumer Survey and are qualitative in nature, therefore requiring quantification prior to use. This study first seeks to determine the optimal quantification methodology among a set of approaches spanning three traditions, associated with Carlson-Parkin (1975), Pesaran (1984) and Seitz (1988). The success of a quantification methodology is assessed on the basis of its ability to match quantitative expectations data and on its behaviour in an important economic application, namely the modelling of wages for our sample countries. The wage equation developed here draws on the theoretical background of the staggered contracts and the wage bargaining literature, and controls carefully for inflation expectations and institutional variables. The Carlson-Parkin variation proposed in Curto Millet (2004) was found to be the most satisfactory. This being established, the wage equations are used to test the hypothesis that the advent of EMU generated an increase in labour market flexibility, which would be reflected in structural breaks. The hypothesis is essentially rejected. Finally, the properties of inflation expectations and perceptions themselves are examined, especially in the context of EMU. Both the rational expectations and rational perceptions hypotheses are rejected. Popular expectations mechanisms, such as the "rule-of-thumb" model or Akerlof et al.'s (2000) "near-rationality hypothesis" are similarly unsupported. On the other hand, evidence is found for the transmission of expert forecasts to consumer expectations in the case of the UK, as in Carroll's (2003) model. The distribution of consumer expectations and perceptions is also considered, showing a tendency for gradual (as in Mankiw and Reis, 2002) but non-rational adjustment. Expectations formation is further shown to have important qualitative features.