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A firm offer is made when a seller promises to sell goods at a stated price, usually within a stated period of time. The promise may be expressly made (i.e. clearly stated in words), as when it takes the form of a letter, or it may be "implied (i.e. understood), as when it takes the form of a quotation that contains the words "For acceptance within (so many) days", or similar qualifying words. Like a quotation without qualifying words, a firm offer is not legally binding, even when made expressly, but unlike such a quotation a firm offer is capable of acceptance and once it has been accepted, it cannot be withdrawn. Although a firm offer is not binding until accepted, no reputable seller would risk his reputation by withdrawing his offer before the stated or agreed time.