perfectivity

It is not perfectivity.

Often this is confused with perfectivity, but the only element of perfectivity that exists in Finnish is that there are some perfective verbs.

Another aspect of the language is the core-argument marking strategy, which is a 'fluid S system' in the typology of Dixon (1994) where intransitive subjects are encoded like agents or patients based upon a number of semantic properties as well as the perfectivity of the event.