Full Idea
Possible worlds are (to a first approximation) properties. [p.12] They are properties of the total universe.
Gist of Idea
Possible worlds are properties
Source
Robert C. Stalnaker (Mere Possibilities [2012], 1)
Book Reference
Stalnaker,Robert C.: 'Mere Possibilities' [Princeton 2012], p.3
Related Idea
Idea 16443 Properties are modal, involving possible situations where they are exemplified [Stalnaker]