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focused on the governance of several policies in Mexico City (Ugalde and Le Galès 2017), Paris (Le Galès 2020) and Milan (Andreotti 2019).

      Therefore, a fortunate contemporary convergence is identifiable, potentially enhancing our understanding of how city politics and policies work worldwide. While urban studies were expanding their comparativism (Robinson 2011), comparative political science has been rediscovering subnational politics (Giraudy et al. 2019). This book intends to contribute to this ongoing debate while constructing bridges between these fields at the same time as emphasizing the specificity of city politics and policies within subnational politics.

      In an unusual convergence, political science has also been revitalizing its approach to comparisons. Nation‐state comparisons are a classic subject of studies in comparative politics (Evans et al. 1985; Levitsky and Roberts 2011) and methods (Tilly 1992; Ragin 1987). The field has also compared cities for a long time (Ruchelman 1969; Ferman 1985), as well as subnational variations more recently (Weitz‐Shapiro 2014). Lately, however, comparisons between multi‐scales in different countries (Pasotti 2010b; Holland 2018a) have also been incorporated in what Giraudy et al. (2019) call subnational research (SNR) and Sellers (2019) transnational comparisons. In this case, variations in national features may be simultaneously analyzed with local processes and with the connections between national and subnational politics (Sellers and Kwak 2010), renovating our models about political processes and avoiding theory stretching (Giraudy et al. 2019).

      Reviewing the positions of these debates lies way beyond the scope of this introduction, but it is important to state our substantive point of departure vis‐à‐vis comparisons and theory building, to make clear our claims of generalization from São Paulo.

      On the other hand, it is also true that these actors, institutions and processes have quite different features and appear in varying combinations due to the specific historical processes that produced their States, societies and cities. Radicalizing the argument, for example, large cities of the North are studied with a focus on planning, technical capacities and substantive agendas of strong political parties. At the same time, Southern metropolises are usually characterized by the literature in terms of corruption in State contracts, the prevalence of clientelism, the absence of party ideology, or, contradictorily, by vivid civil society dynamics. These differences could persuade us to accept the presence of ontological differences, making knowledge produced from the South substantively different from the kinds produced elsewhere. This would mean that theories have merely regional validity, or, in a more radical version, that theorization is impossible.

      We believe that both these epistemological positions are partly right (and wrong). There are commonalities in processes and actors, but also particularities that must be considered. Many features of Southern cities indeed challenge traditional interpretations, but it is also true that what happens in the former has the same nature of what happens anywhere. This implies that such differences are not ontological. At least for urban politics and policies, the incorporation of Southern cities as ‘normal’ cases – that is, capable of being understood by mobilizing the same elements as other cities – brings into consideration the full variation of the phenomenon in question (local institutions), thus contributing to substantially broader theories, but not substantively different ones.

      This task calls not just for comparisons in general but for detailed comparisons of widely different settings, such as between Southern and Northern metropolises. Similarly, this comparative goal can only be achieved from detailed knowledge of the processes and actors involved, as well as their order and combination, which requires dense case study designs (Ragin 1987). By combining these features, our analysis intends not only to explain the trajectory of urban policies in São Paulo – and especially the construction of redistributive policies – but also to elaborate an analytical framework with actors, processes and governance patterns that can be used, tested and expanded in other large metropolises worldwide.

      When we mention policy changes, the reader may call to mind the need for cities to have creative and innovative policy (and technical) solutions, such as light railways, cable cars, advanced public lighting, computerized traffic control, dedicated corridors, among others. The idea that technological developments are the key to resolving city problems is widely diffused. However, public policy studies have already demonstrated that while good solutions are essential, public policies are in fact about the production and delivery of services, goods and actions. From this point of view, great ideas for policy designs and solutions are only effective if they reach their users, which depends on the local configurations of actors and resources, as well as on the processes that produce policies. This is not to say that inventive policy solutions are not necessary, both in terms of policy products and concerning delivery structures and strategies. Therefore, solutions tend to travel badly and must be both appropriate, in the sense of fitting the situations at hand, and appropriated by the processes and actors involved. Policy change, in this sense, does not equal new policy solutions, although it may include them, as was the case of many policies in São Paulo. In all situations, however, they were accompanied by and/or embedded in public policy programs and delivered through policy processes. Unfortunately, these are much more difficult to produce and deliver than merely technical solutions

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