Predicting Party Sizes

Considerable evidence suggests that social diversity increases the number of political parties. While a vast literature examines this relationship by measuring social diversity as ethnic fragmentation, the convenience of capturing the level of social heterogeneity by using alternative indicators has been traditionally overlooked. In this article, I offer new evidence that documents the impact of social diversity on party system size by proxying the former as the number of social classes. Using both objective class positions and subjective class identifications and employing two different datasets that cover democratic legislative elections around the world between 1981 and 2015, I find that the effective number of social classes has a positive effect on party system fragmentation when the average district magnitude in a democracy is high. Given the difficulty to test these effects in a cross-country environment net of unobserved heterogeneity, I examine the robustness of the findings in Spain between 2000 and 2016, an ideal case due to large differences in district magnitude and a changing party system. Overall, the results suggest that high levels of social diversity are likely to increase party system fragmentation when the electoral system is permissive enough.

This paper shows how an uneven electoral system in Japan shapes political parties' mobilization strategies by utilizing a majoritarian electoral system with heterogeneous district magnitudes, which in turn contributes to the gap in turnout across districts. Scholars have long debated the relationship between electoral systems and turnout; it is known that countries with proportional representation electoral systems – those with larger district magnitude – tend to have higher turnout rates than countries with majoritarian electoral systems, especially single-member district (SMD) systems. The current discussion on turnout and district magnitude of an electoral system assumes a monotonic relationship between these factors: the larger the district magnitude of the electoral system, the more (or less) participatory the electorate, due to competitiveness and mobilization efforts by political parties and other relevant groups. In contrast, this paper shows a mixed relationship between district magnitude of the electoral system and party mobilization and subsequent turnout, investigating a majoritarian electoral system with uneven district magnitude in the Japanese Upper House. During the survey period, the party system in Japan consisted of two major parties and a few smaller parties; consequently, the two major parties focused their efforts on SMDs in order to maximize their seat share, while smaller parties focused their resource on districts electing more than two members (where they have some chance to elect their party's candidates). In combination, these party strategies have resulted in the lowest mobilization and turnout rates in districts with two members.

The seminal work of Arend Lijphart, Electoral Systems and Party Systems (1994), limits the definition of electoral reforms to those affecting electoral formulas, district magnitudes, assembly size, or electoral thresholds. Following this definition, studies on electoral reform have put political parties and their motivations at centre stage. Expanding the definition of electoral reform, however, requires a move beyond parties to explore the multiple possible sources of change. This article examines the most common reforms ofrecent years, electoral gender quota policies, and points to at least four explanations for the adoption of gender quota laws. Based on extensive data from gender quota campaigns, the article suggests that the literature on this topic would benefit from efforts to broaden the analytical focus to include the role of agency, group interests, anddiscursive struggles, and to call attention to the possibility of causal diversity by revealing different routes to electoral reform.

What determines the allocation of voting weights to member states in international organizations? What drives the seat and voting weight allocation in the European Parliament (EP) and in the Council of the European Union (EU)? Our objective in this article is to develop a universal logical model and to demonstrate that the resulting equation indeed captures negotiated outcomes on seat and voting weight allocations in EU institutions from their beginning. We predict seat and voting weight allocations for both the EP and the Council of the EU within one general model. Hence, we do not employ actual data on seat allocations or voting weights in either the EP or the Council of the EU, but instead, use logical constraints exclusively, as posed by the following elements: the total number of seats/voting weights ( S), the number of member states ( N) and, finally, their respective population size ( Pi). Only our final model selection among several theoretical options is guided by empirical information. With no post hoc parameters used, our model fits both the Council of the EU and the EP rather well, over a time span of nearly 40 years. Inspired by the ‘seat—vote equation’ ( Taagepera, 1973 ) for seat allocation in national legislatures, the new ‘seat—population equation’ calculates the number ( Si) of EP seats or Council voting weights of member state i as follows: [Formula: see text], where n = (1/log N − 1/log S)/(1/log N − 1/log P), P being the total population (as summed over all member states). We posit that this equation is applicable to predict outcomes in practice whenever voting weight or seat allocations in international organizations are allocated on the basis of the population shares of their component entities.

JON FRAENKEL At first sight, the Pacific Islands seem like a graveyard for institutional determinist theories regarding the impact of electoral systems on party polarisation. Maurice Duverger’s well-known ‘sociological law’ was that first-past-the-post electoral rules tend to deliver two-party systems. Proportional representation (PR) systems were more loosely associated with multi-party settings.2 Yet in the Pacific, first-past-the-post using countries, such as the Solomon Islands and Papua New Guinea (1975-2002), have developed multipleparty systems. The PR using territories of New Caledonia, French Polynesia and Vanuatu have, at times, veered towards a two-camp polarisation around the issue of independence. Some firstpast-the-post-using democracies, such as Palau and the Federated States of Micronesia, have not witnessed the emergence of any party-based system at all. Neighbouring Kiribati, Nauru and Tuvalu have similar styles of loose and fluctuating parliamentary alliances but no election-oriented political parties, despite the first using a two round electoral system, the second a unique simultaneously tallied preferential voting system, and the third a block voting system in two-member constituencies. Electoral laws would appear to exert negligible sway over Pacific party systems. On closer examination, Duverger’s theory does shed some light on the direction of electoral incentives in some of the Pacific countries, once hedged with the necessary qualifications and confined to appropriate settings. Negative cases, where electoral laws do not bring about the anticipated party structures are not confined to Oceania. India and Canada, for example, have numerous political parties, but use first-past-thepost electoral systems. Guyana uses a list PR system but has a two-party centred system, as did Austria during 1945-1990. Much of the literature has consequently been aimed at heavily revising Duverger’s theories about the impact of electoral laws on party systems, either by emphasising that the critical association is in fact between district magnitude and the number of parties or by specifying the role of intervening variables, such as ethnic heterogeneity or the number of competing ‘issue dimensions’ to the political process.3 It is in situations where a single salient political cleavage (such as Labour/Conservative, or Catholic/Protestant) dominates the political order that distinct electoral laws may work in different directions, encouraging or limiting multi-partyism. In Fiji and New Caledonia, those varying electoral pressures on party systems exerted considerable influence over the success or failure of compacts aimed at mitigating ethnic conflict. In most South Pacific nations, the decolonisation issue did not prove an enduring The contribution of AusAID to this series is acknowledged with appreciation. Discussion Paper 2005/8 State, Society and Governance in Melanesia THE AUSTRALIAN NATIONAL UNIVERSITY

Party systems, that is, the number and the size of all the parties within a country, can vary greatly across countries. I conduct a principal component analysis on a party seat share dataset of 17 advanced democracies from 1970 to 2013 to reduce the dimensionality of the data. I find that the most important dimensions that differentiate party systems are: “the size of the biggest two parties” and the level of “competition between the two biggest parties.” I use the results to compare the changes in electoral and legislative party systems. I also juxtapose the results to previous party system typologies and party system size measures. I find that typologies sort countries into categories based on variation along both dimensions. On the other hand, most of the current political science literature use measures (e.g., the effective number of parties) that are correlated with the first dimension. I suggest that instead of these, indices that measure the opposition structure and competition could be used to explore problems pertaining to the competitiveness of the party systems.

This article is part of the special cluster titled Parties and Democratic Linkage in Post-Communist Europe, guest edited by Lori Thorlakson, and will be published in the August 2018 issue of EEPS This article introduces a special section on parties and democratic linkage in post-communist Europe. It sets out the main objectives and research questions that guide the four articles in this special section, presenting these in the context of the comparative politics literature on party and party system change and democratic development. It introduces the key arguments of the articles in the section, arguing that the contributions identify regionally distinctive patterns of party and party system behaviour in Central and Eastern Europe. These patterns have fuelled a quest for more suitable conceptual and measurement tools and call for diversity in comparative analysis, combining intra and inter regional comparison.

This is the third of three chapters on political party systems and structures of competition, and presents an overall review. In the first section, Approaches to the Classification of Party Systems: A Review it looks at the principal existing approaches to the classification of party systems, pointing to both their limits and possibilities when applied within comparative analysis. It then goes on in the second section, Party Systems and the Competition for Government, to underline the importance of understanding the structure of competition in any given party system, since in many ways the whole notion of a party system is centred on the assumption that there exists a stable structure of competition. Structures of competition can be seen to be either closed (and predictable) or open (and unpredictable), depending on the patterns of alternation in government, the degree of innovation or persistence in processes of government formation, and the range of parties gaining access to government. The emphasis in the third section, Party Systems and Electoral Outcomes, is on the need to distinguish between processes of electoral change on the one hand, and changes in party systems and the structures of competition on the other, a distinction which also allows the possibility of situations in which electoral change is the consequence rather than the cause of party system change.

Party systems represent parts of political systems which arise as a result of interactions between political parties. Party relations produce characteristics which place a particular party system within the typology of party systems. A number of factors can be considered in explaining the nature of party competition, most often placed within the categories of institutional and sociostructural factors. This paper analyses the impact of full and partial social cleavages on party systems. Given that the theory of social cleavages has proved insufficient in explaining party differences and the dynamics of party systems, especially in new democracies, we will improve the analysis by including the concept of partial social cleavages. This research shows the unequivocal influence of dominant social cleavages on the situation and changes in party systems. Although in some cases no changes in the type of party system have occurred, it can be concluded that exactly in those cases there exist permanent and ingrained social cleavages, but also partial cleavages which affect the relations in the party system at the given time. Identity issues stand out as the dominant topic in political competition, especially in the countries where ethnic relations have not been resolved.

The relationship between electoral systems and corruption in a large sample of contemporary democratic nations is analysed in this article. Whereas previous studies have shown that closed-list proportional representation is associated with greater (perceived) corruption than open-list PR, it is demonstrated here that this relationship fails to hold once district magnitude is considered. The theory underlying this study draws on work on ‘the personal vote’ that suggests that the incentives to amass resources – and perhaps even to do so illegally – increase with district magnitude in open-list settings but decrease in closed-list contexts. Extending this insight, it is shown that political corruption gets more (less) severe as district magnitude increases under open-list PR (closed-list PR) systems. In addition, once district magnitude exceeds a certain threshold – the estimates here are that this is as low as fifteen – corruption is greater under open lists than closed lists. Only at small district magnitudes (below fifteen) is closed-list PR associated with more corruption, as conventionally held. These results hold for alternative measures of corruption, for different sets of countries analysed, for different measures of district magnitude and regardless of whether the political system is presidential or parliamentary, and of the number of parties.Using an objective measure of corruption in public works contracting, corroborating evidence is also presented from Italian electoral districts. In Italy's open-list environment in the period prior to 1994, larger districts were more susceptible to corruption than smaller ones.

This article sets out to examine the extent of party system change in Scandinavia since the ‘earthquake elections’ in the early 1970s witnessed the parliamentary breakthrough of new parties and, in particular, the rise of a populist radical right. It deploys an analytical framework derived from Berglund and Lindström's five‐party Scandinavian model and an identification of the ‘core structures’ of the frozen party system in the region. In assessing party system change the significance of changes in the patterns of interaction between parties at the elite level, that is in the governmental and parliamentary arenas, is emphasised over and above electoral change. It is argued that the core features of the Scandinavian party systems have changed much less since 1970 than the structure of party competition and that the single most important development in the party politics of the region has been that the historic non‐socialist groupings have acquired increased ‘relevance’ as coalition parties both severally and collectively. The article concludes by asking: ‘so what?’ Can an indication of the extent of party system change be of assistance in understanding the wider workings of the political system and the operation of the legislative process?

The main goal of this article is to analyse the role of social, political and ideological factors in explaining party system change in Portugal during the democratic period (April 1974June 2005). We begin with the evolving trends in the party system format, and their main effects on the patterns of parties' interactions as well as on the functioning of the political system. This first approach will enable us to divide the democratic period into two distinct phases and an interlude. Following this, we will analyse the dimensions and strength of policy competition between the parties before, finally, analysing the impact of social, political and ideological factors on party system change in Portugal.

Using electoral data from a nearly comprehensive set of the world’s electoral democracies (1992–2014), including 131 independent countries and one non-sovereign territory, this article develops an explanatory model of legislative fragmentation that incorporates electoral fragmentation, the territorial patterns of party support, district magnitude, specific electoral system effects, and the balance of personal and party vote components within the incentive structures generated by electoral rules. The analysis proves that there is a strong negative association between the territorial homogeneity of the vote and legislative fragmentation, and shows that those varieties of electoral rules that increase the salience of personal component in party-centred elections tend to enhance legislative fragmentation. Due to its statistical properties, the model allows for establishing the impact of each of the factors, as well as their relative weights, with a high degree of certainty.

Since 1999, all member states have employed some form of proportional representation to elect representatives in the European Parliament. The introduction of Spitzenkandidaten and greater policy and campaigning coordination within Europarties sought to create a common European ground of party competition. However, the actual election of MEPs remains a national endeavor, determined by a national electoral framework. The electoral success of an Europarty in a given member state is shaped by the conditions set by the national electoral model for European elections. Different national models also give rise to different electoral strategies employed by parties wishing to maximize their number of MEPs. While electoral alliances might reflect cooperation of ideologically similar parties (such as list combinations in the Netherlands) or presidential majorities, like the coalition list of parties that support the French President, sometimes, especially in newer member states (e.g., Croatia), they might represent a strategic choice of ideologically divergent parties to work together in order to pass the threshold and win seats in the European Parliament. This paper seeks to compare different national playing grounds in which Europarties, i.e., their member parties compete, as well as electoral strategies that accompany such different frameworks. Apart from Ireland and Malta, which use the single transferable vote system, all other (current) member states use list proportional representation. However, the choice of a national electoral district or division in regional electoral constituencies can have a significant impact on electoral outcomes. Further, the employment of an electoral threshold and its interaction with district magnitude can create different electoral conditions. Finally, methods of seat allocation have an impact on prospects of smaller parties. A comparison of national electoral models will uncover different conditions and levels of (dis)proportionality that all weave together into the ultimate makeup of the European Parliament.

The nationalisation of politics is a major political phenomenon deriving from the historical trend towards the formation of national electorates and party systems brought about by the progressive reduction in the significance of territorial cleavages. During the last 50 years, though the issue of vote nationalisation has been addressed by a large volume of literature, serious analysis of the Italian case has never made much progress, having been limited to the reflections of a few isolated authors. Over the past 20 years, a period marking the passage from the long period of polarised pluralism to the so-called ‘Second Republic’, the Italian party system has undergone profound changes, with the continuing emergence and growth of new political parties and a sharp increase in the levels of party fragmentation and volatility. How has nationalisation of the vote evolved in this changing framework? This article analyses the process of (de)-nationalisation of the vote in Italy and explains its evolution between the first (1948–1992) and the second (1994–2013) phases of the republican era, assessing the impact of various possible determinants. The empirical analysis shows that vote nationalisation in Italy is strongly associated with competition factors and with the level of institutionalisation of the party system.