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The article examines the degree of institutionalization of the Guatemalan party universe across four areas: the pattern of inter‐party competition; the rootedness of parties in society; the legitimacy accorded to parties and democratic institutions; and the nature of internal party organization. Guatemala displays an extremely inchoate party structure across all these variables. There is no stability in the identity of the main parties in the polity. After more than two decades of electoral democracy, no single party has been able to avert a drift into electoral irrelevance or outright disappearance. With respect to the basic facets of internal party organization, Guatemalan parties exhibit a feebleness so pronounced that their very status as parties is questionable. In general, Guatemalan “parties” only fulfill Sartori's minimalist definition as organizations that field candidates for public office, but offer nothing more substantive.

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This article makes a case for expansion of the conceptual framework for the classification of party universe types. In particular, it introduces the concept of ‘party non-systems’, defined as those party universes characterized by a fundamental absence of inter-temporal continuity in the identity of the main parties. At the heart of this concept is the explicit differentiation between intra- and extra-systemic volatility. Party non-systems are characterized by persistently high transfers of votes away from the main parties towards new and small parties (i.e. high extra-systemic volatility), an ever-changing constellation of parties without a stable ‘core’. It is argued that the difference between non-systems and all other party universe types is not only one of degree (in level of institutionalization), but also one of kind. This conceptual innovation is then applied to a number of Latin American cases (Guatemala, Ecuador, Peru and Bolivia) at the low end of the institutionalization continuum to highlight important cross-country and inter-temporal differences in the nature of (core) party competition.