L’expérience de la « Grande Récession » a conduit économistes et praticiens à porter une attention particulière àla stabilité financière,mais aussi, dans la perspective de sortie de crise, aux moyens de financer l’émergence d’unnouveau modèle de croissance plus durable.Dans ce contexte, notre thèse se propose d’apprécier l’influence de laconcurrence bancaire sur la stabilité et sur l’efficience, afin d’éclairer le débat sur le degré de concurrence optimalen Europe. À cet effet, on étudie, tout d’abord, les effets de la concurrence bancaire sur l’instabilité financière, ense saisissant du concept de risque systémique. Cela nous conduit à mener à bien deux études distinctes : l’uneportant sur la répartition du risque systémique entre entités financières, l’autre sur la procyclicité financière.Dansles deux cas, nous concluons à l’existence d’un lien positif entre concurrence et stabilité. Nous nous intéressonsensuite à la question de la stabilité en termes d’efficacité de la politique de stabilisationmonétaire. Dans ce cadre,on met en évidence que la concurrence bancaire améliore l’efficacité de deux canaux de transmission : le canal destaux d’intérêt et le canal du crédit bancaire. L’insuffisance de l’intégration bancaire européenne, dont témoignel’hétérogénéité de la concurrence, s’avère ainsi un facteur explicatif de la fragmentation observée de la zone euro.Finalement, nous considérons la possibilité que la croissance économique puisse être fonction de la concurrencebancaire. À cet effet, on montre d’abord que cette dernière aurait théoriquement deux effets contradictoires sur lacroissance économique, avant finalement, de faire valoir empiriquement que la concurrence bancaire exerce, enEurope, des effets négatifs sur la croissance économique, en particulier en freinant la croissance de la productivitéglobale des facteurs. Nos travaux accréditent donc l’idée que stimuler la concurrence conduit à un arbitrage entrestabilité et efficience. / The experience of the “Great Recession” has led economists and policymakers to pay particular attention tofinancial stability. It also lead them to think how to get out of this recession, and particularly on the meansof financing the emergence of a new, more sustainable growth model. In this context, this thesis studies theinfluence of bank competition on stability and efficiency in order to shed light on the debate about the optimallevel of bank competition in Europe. For this purpose, we first study the effects of bank competition on financialinstability by focusing on the concept of systemic risk. This leads us to undertake two distinct studies: onefocusing on the distribution of systemic risk between financial institutions; the other on financial procyclicality.In both cases, we conclude that a positive link between competition and stability does exist.We then focus on thequestion of stability in terms of the effectiveness of the monetary stabilisation policy. In this respect, we show thatbank competition improves the efficiency of two channels of monetary transmission: the interest rate and thebank lending channels. Therefore, the lack of European banking integration, highlighted by the heterogeneity ofbank competition, is one factor that explains the fragmentation that can be observed in the Eurozone. Finally, weconsider the possibility that economic growth may be a function of bank competition. To do this, we first showhow competition could impact economic growth in theory, and find two opposing effects. We then demonstrateempirically that bank competition has negative effects on economic growth, in particular by decreasing totalfactor productivity growth. Our work hence supports the idea that stimulating competition leads to a trade-offbetween stability and efficiency.

Esta tesis se ocupa de los problemas de la estimación econométrica con muestras pequeñas, en los contextos del los VARs monetarios y de la investigación empírica del crecimiento. Primero, demuestra cómo mejorar el análisis con VAR estructural en presencia de muestra pequeña. El primer capítulo adapta la especificación con prior intercambiable (exchangeable prior) al contexto del VAR y obtiene nuevos resultados sobre la transmisión monetaria en nuevos miembros de la Unión Europea. El segundo capítulo propone un prior sobre las tasas de crecimiento iniciales de las variables modeladas. Este prior resulta en la corrección del sesgo clásico de la muestra pequeña en series temporales y reconcilia puntos de vista Bayesiano y clásico sobre la estimación de modelos de series temporales. El tercer capítulo estudia el efecto del error de medición de la renta nacional sobre resultados empíricos de crecimiento económico, y demuestra que los procedimientos econométricos robustos a incertidumbre acerca del modelo son muy sensibles al error de medición en los datos. / This thesis deals with the problems of econometric estimation with small samples, in the contexts of monetary VARs and growth empirics. First, it shows how to improve structural VAR analysis on short datasets. The first chapter adapts the exchangeable prior specification to the VAR context, and obtains new findings about monetary transmission in New Member States. The second chapter proposes a prior on initial growth rates of modeled variables, which tackles the Classical small-sample bias in time series, and reconciles Bayesian and Classical points of view on time series estimation. The third chapter studies the effect of measurement error in income data on growth empirics, and shows that econometric procedures which are robust to model uncertainty are very sensitive to measurement error of the plausible size and properties.

Submitted by Raimundo Câmara Filho (raimundo.camara@enel.com) on 2015-11-02T20:57:35Z No. of bitstreams: 1 Dissertação Versão aprovada, com ficha catalográfica e assinaturas da banca.pdf: 1997770 bytes, checksum: aa296c2e80c524f65734265773e7072e (MD5) / Approved for entry into archive by GILSON ROCHA MIRANDA (gilson.miranda@fgv.br) on 2017-04-19T19:06:48Z (GMT) No. of bitstreams: 1 Dissertação Versão aprovada, com ficha catalográfica e assinaturas da banca.pdf: 1997770 bytes, checksum: aa296c2e80c524f65734265773e7072e (MD5) / Approved for entry into archive by Marcia Bacha (marcia.bacha@fgv.br) on 2017-05-05T17:02:42Z (GMT) No. of bitstreams: 1 Dissertação Versão aprovada, com ficha catalográfica e assinaturas da banca.pdf: 1997770 bytes, checksum: aa296c2e80c524f65734265773e7072e (MD5) / Made available in DSpace on 2017-05-05T17:03:45Z (GMT). No. of bitstreams: 1 Dissertação Versão aprovada, com ficha catalográfica e assinaturas da banca.pdf: 1997770 bytes, checksum: aa296c2e80c524f65734265773e7072e (MD5) Previous issue date: 2007-05-31 / Monetary policy actions are believed to be transmitted to the economy through their effects on market interest rates. However, it is observed that the relationship between monetary policy and market interest rates seems quite complex. Although casual observation suggests a close connection between monetary policy actions and short-term interest rates, the relationship between policy actions and long-term interest rates is not so evident. This study estimates the response of the Brazilian term structure of interest rates, from the implementation of the Inflation Targeting Regime until March 2007. Using a model that captures the tendency of market rates to anticipate policy actions, this study finds evidence of a stronger response of long-term rates to innovations in the Selic rate than found in previous research. / A política monetária é transmitida à economia através de seus efeitos sobre o mercado de taxas de juros. Na prática, entretanto, observa-se que o relacionamento entre a taxa de juros básica e as demais taxas de juros de mercado aparenta ser bastante complexo. Ainda que exista farta evidência de que a política monetária produza efeitos previsíveis sobre as taxas de juros de curto prazo, a relação entre as ações de política monetária e as taxas de juros de prazos mais longos não é tão evidente. Nesse estudo, estima-se a resposta da estrutura a termo de taxas de juros brasileira às medidas de política monetária anunciadas, desde a implantação do regime de metas de inflação até março de 2007. Utilizando um modelo simples, mas que captura a tendência do mercado de antecipar as futuras ações de política monetária, encontramos uma resposta muito maior do que as reportadas em estudos anteriores.