Individual and Collective Time-Consistency.

This paper reconsiders the Strotz-Pollak problem of consistent planning and argues that a solution to this problem requires a refinement of subgame-perfectness. Such refinement is offred through an analysis based on Greenberg's "theory of social situations". A unifying framework is presented whereby consistent one-person planning as a problem of individual time-consistency and renegotiation-proofness as a problem of colective time-consistency are captured through the same general concept.