Depuis son éruption en septembre 2009, la crise de la zone euro a été au centre de l'attention des économistes et des décideurs politiques. L'objectif principal de cette thèse est de développer des modèles théoriques pertinents afin d'analyser les facteurs à l'origine de la crise jumelle des banques et de la dette souveraine dans une union monétaire avec une architecture institutionnelle globalement similaire de l'Union économique et monétaire avant 2012. Tout en mettant l'accent sur la vulnérabilité financière, nous explorons la relation entre le secteur bancaire, l'économie réelle et le budget du gouvernement dans le contexte d 'une union monétaire. Cette thèse se compose de quatre modèles théoriques de la crise bancaire, avec le premier illustrant la crise financière qui avait éclaté en 2008 dans les petites économies européennes en dehors de l 'UEM et les trois modèles suivants élucidant la situation de crise dans la zone euro en2009 jusqu'en 2012. / In this Ph. D. thesis, we analyze the conditions for the emergence and the aggravation of the recent crisis in Europe from 2008 to 2012. The major objective of this Ph. D. thesis is to develop theoretical models which will be effective in investigating the twin banking and sovereign debt crises in a monetary union with a broadly similar institutional design to the EMU before 2012. Different from 'traditional' financial crisis models that shed light on the role of the central bank in crisis policy response, the models developed in this thesis investigate and underline the importance of fiscal crisis management. White accentuating financial vulnerability, we explore the relationship between the banking sector, the realeconomy and the public budget in the context of a monetary union. This thesis consists of four theoretical models of the banking crisis, with the first framework depicting the financial crisis which burst in 2008 in small European economies outside the EMU and the next three models elucidating the crisis situation in the Eurozone from early 2009 until August 2012.

Thesis uses game theory to explain behavior of certain states in the European sovereign-debt crisis. The goal is to find out, if those states use strategies leading to equilibrium i.e. if they maximize their expected utility. Theoretical part is based mainly on repeated games and Bayesian game. Thesis summarizes development of European sovereign-debt crisis and key economic indicators. It constructs a game model of the crisis and further analyses situation of Germany, France, Italy, Spain and Greece as players in the game. The game model is then tested on key conflict situations such as relations of France and Germany, first Greek bailout negotiations or Spanish bank bailout negotiations. The results show that chosen states do maximize their expected utility in one election period. However maximization of utility in two or more election periods is limited by the parameters of democratic election system - length of election periods and information asymmetry between voters and politicians. The costs of elimination of information asymmetry would be higher than the costs of debt crisis. So even considering the costs of debt crisis the states are in long term equilibrium.