If a quotation is made together with all necessary terms and conditions of sales, it amounts to an offer.
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Offer can be divided into firm offer and non-firm offer.
When a seller receives an enquiry, does he have obligation to reply?
Non-firm offer usually contains the words “subject to our final confirmation”,“just for reference”.
Non-firm offer usually contains such expressions as “for acceptance within... days”, “firm offer”, “be valid before...”, etc.