The possible origins of the various alignment patterns attested in the world's languages have been the object of sustained interest in both language typology and historical linguistics (see Dahl 2021a for a recent overview). What is meant here by alignment, in a maximally general sense, is any pattern pertaining to the distribution of particular coding or behavioral properties (e.g., particular case or indexation forms, particular control patterns, particular word orders) across different verbal arguments. The latter include the three arguments, A, S, and P (that is, following a well-established tradition, the two arguments of monotransitive clauses and the only argument of intransitive clauses), as well as the three arguments of ditransitive clauses (A, T, and G; see, for example, Zúñiga 2018). In the functional-typological research paradigm that originated from the work of Joseph Greenberg, alignment has generally been accounted for in terms of principles of optimization of grammatical structure, in the sense that individual alignment patterns are assumed to be beneficial for the user. A first idea is that alignment reflects the relative need to disambiguate particular arguments. This provides an explanation for the cross-linguistic rarity of patterns where A and P arguments are treated in the same way in regard to the relevant properties, whereas S arguments are treated differently. The former two arguments co-occur within the same clause, so they need to be disambiguated from each other and will not be treated in the same way. S arguments, on the other hand, occur in isolation, so they can be treated in the same way as either A or P arguments (see Comrie 1989, among others, for an application of this idea to case marking alignment). This presupposes a principle of economy whereby speakers will not use distinct forms for different arguments unless they genuinely need to do so, that is, for arguments more in need of disambiguation. A second idea is that arguments that are treated in the same way share particular semantic or pragmatic properties, so that morphosyntactic similarity between
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