Hétong guīdìng, màifāng bìxū zài shí tiān zhīnèi jiāohuò.
The contract states that the seller must deliver the goods within ten days.
Tips
usage
The formal word in contracts and economics, paired with 买方 'buyer'. When goods are scarce and sellers set the terms, it is a 卖方市场 'seller's market'; the reverse is a 买方市场.