Subgame Perfect Equilibrium

Principle

The concept mandates that in any sequential game, such as multi-stage option exercise or decentralized governance voting, the optimal strategy for any subgame must be a Nash Equilibrium of that subgame. This backward induction process ensures that the overall strategy profile is internally consistent and credible at every decision node. Deviation from this principle implies that a participant has an incentive to deviate later in the game.