Conceptions of party family serve as signals to political actors, but also as analytical categories for scholars to classify parties with the purpose of developing theoretical arguments about their origins, electoral and executive government trajectory, and policy impact. Historically, political “brands” and scholars’ efforts to distinguish party “families” originate in the mobilization of mass parties following the introduction of universal suffrage and pinnacle in the literature on political cleavage formation. For contemporary research, party families may be classified by at least three analytical dimensions indicating principles according to which they generate policy positions on questions of economic distribution (greed), political and social governance (grid), and delineation of polity membership status (group). The configuration of positions on the three dimensions constitutes a party’s ideology, which may be grouped into a party family. In any particular polity, only a subset of the conceivable ideological positions is empirically present. Moreover, there are parties that change their party family affiliation over time, if not their brand names. Finally, many party classifications do not meet the criteria of party family as introduced here. This applies to the characterization of parties according to whether they are based on personalism, clientelism, cartel formation, catch-all politics, or niche strategy.
The internal market is the workhorse of European integration, promoting the free movement of goods, capital, services, and factors of production to ease cross-border barriers. Research has focused on the evolution and expansion of market integration, drawing on a variety of empirical and theoretical approaches to understand the interests, institutions, and ideas that have shaped an “ever closer economic union.” Yet as the economy has changed from manufacturing to services, the internal market has shifted in scope to encompass a more heterogeneous set of issues where the core rules and legal commitments have generated increased differentiation in market practices and regulatory alignment. Scholarship on the single market has diminished, in part, due to the fragmentation of policy initiatives, often not attributed to the single market. As the European economy has undergone profound structural changes, the legislative agenda has expanded to new policy areas that reflect the need for modernization and expansion of the traditional single market agenda. Often touted as a model for regional integration, the single market is still a differentiated market, much more developed for goods than it is for services and labor. The result is a regulatory patchwork of selective liberalization where the scope and depth of integration vary across the four freedoms. Ironically, the integrity of the single market in the wake of Brexit has led the “four freedoms” of goods, services, capital, and people to be viewed as “indivisible” which does not reflect the reality of decades of market integration. More attention needs to be given to the incorporation of history and temporality into understanding the single market. On the one hand, the single market is viewed as a means of transferring regulatory norms to third-country markets which has led to a debate about the extent of European “market power” across different issues areas. Rooted in the size and institutional configurations of its internal market, European efforts to export rules to third-country markets also depends on domestic receptiveness and state capacity to accept such jurisdictional boundaries over markets. As the internal market has varying degrees of “depth” across treaty freedoms, its “spillover” effects may differ across goods and service markets. On the other hand, there has been a surge in single market differentiation within the European polity in terms of modes of governance. This reflects growing flexibility in terms of fundamental treaty requirements, the varied compliance and implementation across sectors and firms, and the differential effects of withdrawal from the single market across member states given the substantial consequences of Brexit. Across time and space, the detailed patterns governing the four freedoms and flanking policies of the internal market in Europe are not uniform with differentiation in institutional (legal and administrative) arrangements that have significant trade-offs in terms of social legitimacy and economic competitiveness.