Grammaticalization is characterized by robust directional asymmetries (e.g., Kuteva et al. 2019). For instance, body-part nominals develop into spatial adpositions, minimizers develop into negation markers, and subject pronouns become agreement …
The comparative method depends crucially on the phylogenetic tree of the languages under comparison, but in many linguistic families, including Indo-European, the true tree is unknown. To circumvent this issue, frequency heuristics have been devised …