The transport must be through a trade intermediary (a yen) where unavoidable, certified document production, the country's trade opportunity, if Thai Thai does not produce itself, it will not be exported.
Commercial shipping that goes through an intermediary (agent) is inevitable, certification, production, waste opportunities in Thailand if Thailand does not produce itself, it can not be exported.
Transport to trade through a medium (a yen) inevitably, document production, the opportunity cost of trade if Thai doesn't produce also will not be exported.