Greece became during the last six years symbol of economic crisis in Europe. What has Greece led, however, to this deep economic or rather social crisis? This master thesis examines the effects of the entry of Greece to European Economic and Monetary Union in 2001. The central question deals with the connection of the introduction of Euro and the magnitude of corruption as well as their effect on the Greek social structure. The problems of corruption and clientelism were posed theoretically according to well-chosen Greek, German and English literature. Furthermore these were put on the basis of secondary analysis of already conducted studies and personal calculations grounded on these data.A short historical review on the Greek political culture since the foundation of the state in 1830 is taken as a starting point. Subsequently the concepts "corruption" and "clientelism" are shown and sociological reflected, followed by an analytical review of Greek political party system. In the empirical part of the present work political and bureaucratic corruption are inquired under the influence of Euro on agriculture, industry, EU subsidies, private consumption and Greek society. After the secondary analysis could be verified that the introduction of Euro contributed to the current economic and social crisis in Greece. Corruption and clientelism were thereby strengthened. Indeed, is to be held on that an essential reason for the transformation of Greek society is its change from an agrarian to a service society, which had already occurred before the introduction of Euro.