There is a rule of thumb in international trade stating that any transaction having a profit margin over 10% is a good deal.
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The commission payment of an FOB price should be calculated based on the FOB net price.
The nature of relationship between the seller and buyer is irrelevant to the pricing decision in international trade.
A buyer cabled an acceptance to an offer, but requiring to change payment from D/P at sight to D/A. The seller kept silence. A contract could be established at this moment.
In a price communication, it is always the buyer who makes an inquiry and the seller makes an offer.