A—Acquisition costs J—Credit level B—Actual costs K—Customer relationship C—Arrival notice L—Duty free zone D—Balance of trade M—Electronic commerce E—Bill of lading N—Free trade zone F—Buyer behavior O—Indirect cost G—Cash conversion P—Minimum weight H—Certificate of origin Q—Net weight I—Chain of customers Example: ( A ) 购置成本 ( H ) 原产地证明 9 ( ) 免税区