Open borders ignore social coordination

Policy models that treat migration as only an economic supply shock overlook social coordination costs: cultural congruence, enclave formation, and local congestion change how quickly immigrants assimilate and how benefits are distributed. Treating history and social equilibria as primary evidence, rather than bending data to neat theoretical models, produces different policy prescriptions about scale, skills, and targeted integration. — This reframes immigration debates from an abstract economic optimisation problem to a social‑coordination problem with time‑dependent assimilation and local public‑good effects, affecting arguments about open borders, quotas, and targeted skills policy.