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Non technical summaryThis paper examines the evolution of returns to education in the West German labour market in the period 1984-2004. Graduates from the period of educational expansion in the 1960s and 70s entered the labour market during the period of observation. With a lag, this educational expansion contributed to skill upgrading of the labour force. Our paper tries to contribute empirically to the question, whether this upgrading of schooling "devaluated" its monetary returns in the labour market in the longer run. Based on data from the German Socio-Economic Panel (GSOEP) we estimate returns to education over the past twenty years in West Germany differentiated by socio-economic characteristics to take into account demographic factors and the rise in female labour market participation.A major challenge for empirical research on returns to education is that school choice involves complex decision processes. For instance, students may select themselves into secondary or post secondary education based on unobserved factors like ability, preferences, and parental household income. Students may choose to go to university because of their high skills and abilities. Students from a poor household may leave the educational system earlier because of financial constraints. As a result presumably there will be no single effect of an educational choice on wages but rather a whole distribution of such effects, i.e. returns vary across individuals. In order to tackle these issues we apply two estimation methods. On the one hand, Wooldridge's (2004) approach uses a set of observable control variables. On the other hand, Garen's (1984) control function approach requires an instrumental variable that influences the educational decisions but not the wage outcome.For the population of workers from the GSOEP, we find that both approaches produce estimates of average returns to education that decrease until the late 1990s and increase significantly afterwards. According to the Wooldridge approach, returns to one additional year of education fell from 6.5 percent in 1984 to 4.9 percent in 1998. From 1998 onwards, we find increasing returns to education reaching a new local maximum of 6.4 percent in 2002 which is just below the overall maximum in 1984.Regarding the gender aspects, the average returns to education seem to have been larger for women during the 1980s and early 199...