Political party
Social cleavages

One of the core explanations for the existence of political parties is that they arise from pre-existing divisions among people: society is divided in a certain way, and a party is formed to organize that division into the electoral competition. By the 1950s, economists and political scientists had shown that party organizations could take advantage of the distribution of voters' preferences over political issues, adjusting themselves in response to what voters believe in order to become more competitive. Beginning in the 1960s, academics began identifying the social cleavages in different countries that might have given rise to specific parties, such as religious cleavages in specific countries that may have produced religious parties there.

The theory that parties are produced by social cleavages has drawn several criticisms. Some authors have challenged it on empirical grounds, either finding no evidence for the claim that parties emerge from existing cleavages, or arguing that the claim is not empirically testable. Others note that while social cleavages might cause political parties to exist, this obscures the opposite effect: that political parties also cause changes in the underlying social cleavages. A further objection is that, if the explanation for where parties come from is that they emerge from existing social cleavages, then the theory is an incomplete story of where political parties come from unless it also explains the origins of these social cleavages.
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