Behavioral economicsCognitive psychologyDaniel GoldsteinEgo depletionExecutive functionHabit formationMental musclePrefrontal cortexSelf-controlSelf-disciplineWillpower다니엘 골드스타인 6 Dec 2025 Daniel Goldstein - I think self-discipline is something, it's like a muscle. The more you exercise it, the stronger it gets. "I think self-discipline is something, it's like a muscle. The more you exercise it, the s…