Many American and European cities have to deal with demographic and economic trajectories leading to urban shrinkage. According to official data, 13% of urban regions in the US and 54% of those in the EU have lost population in recent years. However, the extent and spatial distribution of declining populations differ significantly between Europe and the US. In Germany, the situation is driven by falling birth rates and the effects of German reunification. In the US, shrinkage is basically related to long-term industrial transformation. But the challenges of shrinking cities seldom appeared on the agendas of politicians and urban planners until recently. This article provides a critical overview of the development paths and local strategies of four shrinking cities: Schwedt and Dresden in eastern Germany; Youngstown and Pittsburgh in the US. A typology of urban growth and shrinkage, from economic and demographic perspectives, enables four types of city to be differentiated and the differences between the US and eastern Germany to be discussed. The article suggests that a new transatlantic debate on policy and planning strategies for restructuring shrinking cities is needed to overcome the dominant growth orientation that in most cases intensifies the negative consequences of shrinkage.

At the beginning of the 21st century, the phenomenon of shrinking cities was widely discussed across Europe. Most European countries saw an increasingly ageing population and an internal migration from underdeveloped to more competitive locations. Since the turn of the century, and in contrast to the past, a great deal has been written about the causes and impacts of shrinkage, as well as about policies and planning strategies. However, the state of knowledge in a cross-national comparative perspective is rather poor because, to date, studies have basically analysed large cities and empirical evidence hardly shifts attention to the contextual influence on local dynamics. Against this background, this paper fills the gap between macrotheoretical conceptualisation and empirical observation by testing a heuristic model of urban shrinkage encompassing the whole range of cities in Europe. The paper questions to what extent urban shrinkage represents a broader trend in Europe in terms of both duration and distribution, and aims to investigate the influence of economic and demographic drivers on the non-linear evolution of shrinking cities in Europe. Thereby, the spatial distribution of different trajectories of shrinking cities in urban Europe in the period from 1990 to 2010 will be presented in a comprehensive survey which reveals that 20% of European cities experienced shrinkage between 1990 and 2010, whereas 883 cities face recent shrinkage.

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At the beginning of the 21st century, the majority of Europe's cities experienced a population decrease. Dealing with the results of demographic, economic and physical contraction processes and planning for the future of considerably smaller but nevertheless livable cities presents some of the most challenging tasks for urban Europe in the near future. This article highlights the example of Dresden in Eastern Germany, where the breakdown of the state-directed economy caused economic decline, industrial regression, and high unemployment rates. Due to out migration and decreasing birth rates, the city lost 60,000 of its 500,000 residents within one decade. As a consequence, there were housing and office vacancies as well as infrastructure oversupplies. Yet the administrative system was still directed towards growth objectives throughout the 1990s. Only after 2000 this situation changed dramatically. The new strategic plan for Dresden is no longer growth oriented. Instead, it focuses on a model of the compact 'European city', with an attractive urban centre, reduced land consumption, and a stable population. However, in another unexpected turn of events, within the last seven years the city has experienced an unexpected growth of 25,000 residents. Surprisingly, processes of suburbanization have turned into processes of reurbanization. Today in Dresden, areas of shrinkage and decline are in close proximity to prospering and wealthy communities. The strategic challenge is to deal with this patchwork while accepting that the future remains unpredictable. Hence, strategic flexibility becomes more important than the strategy itself. To a certain extent rational analysis and error prevention is displaced by preparedness, robustness, and resilience as key qualifications of planning in shrinking cities. Shrinking Cities in Europe -A Challenge to PlanningIn current planning debates the term 'shrinking city' usually describes a densely populated urban area that has on the one hand faced a population loss in large parts and is on the other hand undergoing economic transformations with some symptoms of a structural crisis (Pallagst et al., 2008). According to Oswalt and Rieniets (2006) more than a quarter of , for instructive discussions on various aspects of shrinking cities and to anonymous referees for their helpful comments and suggestions on an earlier draft.

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