La première partie de la thèse se propose de montrer commentl’analyse du changement structurel doit être abordée, pas seulement du point de vuedes conditions de l’offre mais également du point de vue de la demande. La prise encompte de ces deux aspects du processus de développement, en suivant lesanalyses de Harrod, Prebisch, Kaldor et Thirlwall, a permis d’identifier l'existenced'une contrainte structurelle à la croissance, résultant de la dynamique particulière ducommerce extérieur dans les pays les moins avancés. Les différents modèlesthéoriques qui formalisent cette restriction ont été analysés et, un test empirique aété effectué sur la Loi de Thirlwall dans cinq pays émergents (Brésil, Colombie,Singapour, Corée du Sud et la Malaisie).Dans la deuxième partie de la thèse, l’accent a été mis sur l'analyse historique duprocessus de changement structurel en Corée du Sud et en Colombie, en vue decomprendre comment les deux pays ont lutté contre cette contrainte et commentcette dernière a influé sur leur croissance à long terme. / In the first part, the thesis discusses structural change, not only from offerconditions but also from the point of view of the demand parameters. Following theHarrod, Prebisch, Kaldor and Thirlwall analysis, we identified the existence of astructural constraint to growth, as a result of the particular foreign trade dynamic inthe less advanced economies (demand for imports vs. demand for exports). Weexamined the different theoretical models that formalize such restriction and, weelaborated a Thirlwall's Law empirical test in five emerging economies (Brazil,Colombia, Singapore, South Korea and Malaysia).In the second part, the thesis examines the structural change process in South Koreaand Colombia, in order to understand how these countries, have deal with thisrestriction and how it has impacted their long-term economic growth. To accomplishthis historical analysis, the key concepts of French regulation school areincorporated.

The submitted thesis is composed of three different articles dealing with issues of financial innovation, credit constraints, and their impact on welfare. The first article treats the contemporary theoretical grasp of the interaction between the financial and real economies, focusing primarily on the role of modern financial innovation in the business cycle. For this purpose, a framework promoted by the Regulation School and Post Keynesians is frequently employed, whilst some other unorthodox streams and mainstream economics are partially discussed as well. All of them aspire -- either per se or under the pressure of the contemporary economic agenda -- to clarify the evolution of financial innovation and credit in the recent era. It is generally found that certain consensus across the schools of economic thought exists, but some of them have done a better job in predicting the consequences of the financial innovation for real economic activity than others. Further, two dynamic macroeconomic models are developed in order to, inter alia, identify the possible effects of extended credit availability presented in the former article on the example of the housing market, and simulate the effects of housing price changes on general welfare. Clearly, this part of the thesis exhibits the indirect consequences of financial innovation as, once again, being rather ambiguous: after having partially unleashed the unprecedented credit granting in the economy, impacting interest rates and loan-to-value ratios, with a subsequent impact on housing prices, it has also influenced credit constrained and unconstrained households in a different manner. Based on an analysis of the situation using partial and general equilibrium analytical frameworks, two somewhat different conclusions are drawn up with respect to the occurrence of various shocks in the models. Under the partial equilibrium framework the effects of relaxation of credit constraints are visible and quite straightforward, indicating relatively simple and intuitive relationship between the price appreciation and general welfare. This is primarily perspicuous for the credit constrained households. In the general equilibrium framework, on the other hand, the transitional dynamics of shock proliferation is more transparent and the impact on credit constrained vs. unconstrained households is more ambiguous and much different from the basic intuition used in the article anchored in the partial equilibrium toolbox.