Recent research on the development of social investment has demonstrated reform progress not only in different regions of Europe, but also in Latin America and South-East Asia. However, the specific substance of the social investment agendas varies strongly between these regions. Why have social investment ideas and policies been more developed in some regions and countries than in others? Building on the theoretical framework of this volume, our chapter suggests that the content of regional social investment agendas depends on policy legacies in terms of investment vs consumption-oriented policies and their interaction with structural pressures. In a second step, we argue that the chances of social investment agendas to be implemented depend on the availability of political support coalitions between organizational representatives of the educated middle classes and either business or working-class actors. We illustrate our claims with reference to family policy developments in France, Germany, and Switzerland.