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trade country policy model sanction study capital impact world effect table paper development variable market bergeijk economy van bergeijk import result level target export value change production analysis growth research crisis diplomacy period disaster investment number example price technology success gravity figure increase competition sample journal adjustment economic technology capital stock equation section trade flows labour edition source 3 rd edition gravity model collapse university income factor ecowa 0.1 p.a.g estimate world trade collapse capita difference share regime state government probability structure embassy karel volume inflation world trade observation