Despite the large body of literature on the emergence and success of new political parties in Western Europe, few, if any, attention has been paid to investigate new parties from a systemic perspective, therefore exploring their potential effects on party systems. This article focuses on party system innovation (PSInn), defined as the aggregate level of ‘newness’ recorded in a party system at a given election. After having reviewed the extant literature on the topic, the article discusses what a new party is and provides a new index to measure PSInn. The article analyses the evolution of PSInn across 324 elections held in 19 West European countries from 1945 to 2015 and its cumulative effects over time. Although in most countries the party landscape today is still very similar to the one appearing after World War II, data offer clear evidence of a sharp increase of innovation in the last few years.
BarneaSRahatG (2011) Out with the old, in with the ‘new’: what constitutes a new party?Party Politics17(3): 303–320.
2.
BartoliniSMairP (1990) Identity, Competition and Electoral Availability: The Stabilisation of European Electorates 1885–1985. Cambridge: Cambridge University Press.
3.
BirchS (2003) Electoral Systems and Political Transformation in Post-Communist Europe. Basingstoke: Palgrave Macmillan.
4.
BolleyerN (2013) New Parties in Old Party Systems: Persistence and Decline in Seventeen Democracies. Oxford: Oxford University Press.
5.
Casal BértoaF (2014) Party systems and cleavage structures revisited: a sociological explanation of party system institutionalization in East Central Europe. Party Politics20(1): 16–36.
6.
ChiaramonteAEmanueleV (2015) Party system volatility, regeneration and de-institutionalization in Western Europe (1945–2015). Party Politics23(4):376–388.
7.
ChiaramonteAEmanueleV (2016) From dead calm to adventurous waters. Explaining party system (de-)institutionalization in Western Europe (1945–2015). In: 74th Midwest Political Science Association Conference, Chicago, 7–10 April 2016.
8.
DaltonRJFlanaganSCBeckPA (1984) Electoral Change in Advanced Industrial Democracies: Realignment or Dealignment?Princeton: Princeton University Press.
9.
DassonnevilleRHoogheM (2015) Economic indicators and electoral volatility: economic effects on electoral volatility in Western Europe, 1950–2013. Comparative European Politics15(6): 919–943.
10.
EmanueleV (2015) Dataset of electoral volatility and its internal components in Western Europe (1945–2015). Available at: http://dx.doi.org/10.7802/1112 (accessed 20 March 2016).
11.
ErssonS (2012) Electoral volatility in Europe: Assessments and potential explanations for estimate differences. In: Elections, Public Opinion and Parties (EPOP) Conference, Oxford, 7–9 September 2012.
12.
EzrowLHomolaJTavitsM (2014) When extremism pays: policy positions, voter certainty, and party support in postcommunist Europe. The Journal of Politics76(2): 535–547.
13.
FranklinMMackieTValenH (1992) Electoral Change. Responses to Evolving Social and Attitudinal Structures in Western Countries. Cambridge: Cambridge University Press.
14.
GrotzFWeberT (2016) New parties, information uncertainty, and government formation: evidence from Central and Eastern Europe. European Political Science Review8(3): 449–472.
15.
HarmelR (1985) On the study of new parties. International Political Science Review6(4): 403–418.
16.
HarmelRRobertsonJD (1985) Formation and success of new parties: a cross-national analysis. International Political Science Review6(4): 501–523.
17.
HernándezEKriesiH (2015) The electoral consequences of the financial and economic crisis in Europe. European Journal of Political Research55(2): 203–224.
18.
HugS (2001) Altering Party Systems: Strategic Behavior and the Emergence of New Political Parties in Western Democracies. Ann Arbor: University of Michigan Press.
19.
KitscheltH (1988) Left-libertarian parties: explaining innovation in competitive party systems. World Politics40(2): 194–234.
20.
KitscheltH (1995) The Radical Right in Western Europe. Ann Arbor: University of Michigan Press.
21.
KrouwelALucardieP (2008) Waiting in the wings: new parties in the Netherlands. Acta Politica43(2): 278–307.
22.
LijphartA (1999) Patterns of Democracy: Government Forms and Performance in Thirty-Six Democracies. New Haven: Yale University Press.
23.
LittonK (2015) Party novelty: conceptualization and measurement of party change. Party Politics21(5): 712–725.
24.
LucardieP (2000) Prophets, purifiers and prolocutors: towards a theory on the emergence of new parties. Party Politics6(2): 175–185.
25.
MainwaringSScullyTR (1995) Building Democratic Institutions: Party Systems in Latin America. Stanford: Stanford University Press.
26.
MainwaringSGervasoniCEspaña-NajeraA (2016) Extra- and Within-system electoral volatility. Party Politics23(6):623–635.
27.
MairP (1993) Myths of electoral change and the survival of traditional parties. European Journal of Political Research24(2): 121–133.
28.
MairP (1997) Party system change. Approaches and interpretations. Oxford, UK: Clarendon Press.
29.
Mair (2002) In the aggregate: mass electoral behaviour in Western Europe, 1950–2000. In: KemanH (ed) Comparative Democratic Politics. London: Sage, pp. 122–140.
30.
MarinovaDM (2015) A new approach to estimating electoral instability in parties. Political Science Research and Methods3(2): 265–280.
31.
MarinovaDM (2016) Coping with Complexity. How Voters Adapt to Unstable Parties. Colchester: ECPR Press.
32.
MuddeC (2014) Fighting the system? Populist radical right parties and party system change. Party Politics20(2): 217–226.
33.
NohlenDStöverP (2010) Elections in Europe: A Data Handbook. Baden-Baden: Nomos.
34.
PowellENTuckerJA (2014) Revisiting electoral volatility in post-communist countries: new data, new results and new approaches. British Journal of Political Science44(1): 123–147.
35.
RobbinsJWHunterLY (2011) Impact of electoral volatility and party replacement on voter turnout levels. Party Politics18(6): 919–939.
36.
SikkA (2005) How unstable? Volatility and the genuinely new parties in Eastern Europe. European Journal of Political Research44: 391–412.
37.
TavitsM (2006) Party system change. Testing a model of new party entry. Party Politics12(1): 99–119.
38.
TavitsM (2008) On the linkage between electoral volatility and party system instability in Central and Eastern Europe. European Journal of Political Research47(5): 537–555.
39.
WilleyJ (1998) Institutional arrangements and the success of new parties in old democracies. Political Studies46(3): 651–668.
40.
ZonsG (2015) The influence of programmatic diversity on the formation of new political parties. Party Politics21(6): 919–929.
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