English Abstract: This paper establishes a strategic analytical framework for the "scale threshold of effective industrial population, " based on the decomposition of productivity into P = T × (Eₐ × η) from the Community Cohesion Model. It argues that whether a civilization can independently maintain a complete, advanced, and self-iterating industrial system depends not on institutional design alone, but on whether it possesses a sufficient effective industrial population (Eₐ) and whether its efficiency coefficient (η) is systematically released by its political philosophy. The framework strictly applies only to "system states" or "system state alliances" that aim to maintain an independent and complete industrial system—small states fall outside its scope. The paper systematically traces the escalating population thresholds across successive industrial revolutions, introduces the crucial distinction between "initiation threshold" and "maintenance threshold, " and validates the insurmountability of the maintenance threshold through the case studies of Britain, Germany, and the Soviet Union—all of which fell behind in the race for sustainable industrial upgrading. It further argues that cross-sovereign alliances suffer a natural efficiency disadvantage, and that this mechanism is intrinsically linked to the proposition that "reversion pressure points toward unification" in the industrial era. Keywords: Effective Industrial Population; Scale Threshold; System State; Initiation Threshold; Maintenance Threshold; Community Cohesion Model; Productivity Constraint; Deindustrialization.
鑫培 骆 (Fri,) studied this question.