Gong Lun proposes a middle-range theoretical framework for understanding Gong (the Common Good) as the expansion of Si (self-interest), rather than its elimination. It defines Gong by the formula: Radius of Empathy × Temporal Horizon × Willingness to Act. The framework argues that Gong is not a moral ideal but a survival necessity at individual, group, and species levels. It identifies five layers of obstacles (biological instinct, survival pressure, cognitive limitation, systemic rigidity, brok