The 10 states of Southeast Asia have combined to form the developing world’s most successful and durable regional grouping, the Association of Southeast Asian Na-tions, ASEAN. Economic integration among them is high and increasing. The ambi-tious ASEAN Economic Community is scheduled to take effect from December 2015, and should further accelerate this integration. But the socio-economic and institution-al disparities among them are also very large. This paper therefore asks the ques-tion, does it make sense to contemplate a ‘Southeast Asian ...