Subgame Perfect Equilibrium
Table:
Subgame Perfect Equilibrium
Subset of	Nash equilibrium
Intersects with	Evolutionarily stable strategy
Proposed by	Reinhard Selten
Used for	Extensive form games
Example	Ultimatum game

With reference to the table, judge whether the statement is entailed, neutral, or refuted according to the table. Give your final answer in JSON format {"answer": "YOUR ANSWER"}.

Claim: Subgame Perfect Equilibrium is a standalone concept.

answer: refuted