firm offer letter is made when a seller promises to sell goods at a stated price, usually within a stated period of time. The promise may be express (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 seven 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expressly, but unlike such a quotation a firm offer is capable of acceptance and once it has been accepted it cannot be withdrawn.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 letter is not binding until accepted, no reputable seller would risk his reputation by withdrawing his offer before the stated or agreed time.
The letters that follow are examples of firm offers written in the modem business style.