iespaidonimportedgoodsthatarerefundedwhenre-exported.Highlight:tomakeprominent;todrawspecialattentionBulky:takingalotofspace,andoftenofashapedifficulttohandlePerishable:easilytogobadTariff:dutiesimposedongoodsimportedandexportedSpecificduties:dutiesleviedonthebasisofquantity,weight,sizeetc.ofthegoodsAdvaloremduties:dutiesleviedonthebasisofthepriceofthegoodsUnilaterally:donebyonesideorpartyonlyMaritime:connectedwiththeseaornavigationRemittance:moneysentbypose一件商品的成本会因生产规模扩大而减少。Thecostwilldecreaseifthegoodsareproducedonalargescale.在实际中,即使完全的专业化在经济上有利,也可能永远不会发生。Inreality,urevenwhenitiseconomicallyadvantageous.配额或者说数量限制是最常见的非关税壁垒。monformofnon-tariffbarriers.有形贸易指货物的进出口贸易,而无形贸易涉及的是国家间劳务交换。Visibletradeinvolvesimportandexportofgoodswhileinvisibletradeinvolvestheexchangeofservicesbetweencountries.