No abstract

Considerable ambiguity exists regarding the effect of government/opposition status on party platform change. Existing theories predict that (1) it has no effect, (2) opposition parties change more, (3) opposition parties change more after several spells in opposition, and (4) parties' responses vary because of different goal orientations. We propose that a party's aspiration to office, measured by its historical success or failure in entering office, determines a party's reaction to being in opposition or government. We hypothesize that, because of loss aversion, parties with low office aspiration change more when they are in government than when they are in opposition. Conversely, parties with high office aspiration change more as opposition party than as government party. We find evidence for these hypotheses through a pooled time-series cross-sectional analysis of 1,686 platform changes in 21 democracies, using the Comparative Manifesto Data and an innovative measure of party platform change.All replication materials are stored at the AJPS Data Archive on Dataverse and on www.gijsschumacher.nl. the editor of the AJPS and three anonymous reviewers for helpful comments and suggestions.

No abstract

This study introduces a population-ecological approach to the entry and exit of political parties. A primary proposition of population ecology is that organizational entry and exit depends on the number of organizations already present: that is, density. We propose that political parties mainly experience competition from parties in the same ideological niche (left, centre, right). Pooled time-series analyses of 410 parties, 263 elections and 18 West-European countries largely support our expectations. We find that political parties are more likely to exit when density within their niche increases. Also there is competition between adjacent ideological niches, i.e. between centrist and right-wing niches. In contrast to our expectations, neither density nor institutional rules impact party entry. This raises important questions about the rationale of prospective entrants.