Nowadays, to hear many of the oil sellers and operators, particularly their brokers and agents, who are involved in the international open market crude selling, describe it, this document _ called the "Letter of Intent" or LOI, for short _ is not only an essential document for doing crude oil business, but one which every credible person or company engaged in crude buying should always use in initiating a purchase. To many of these operators, not only should crude oil buyers use the LOI to initiate their buying orders, but initiating the purchase order in that manner, they say, has always been the usual way by which credible buyers initiate their purchasing projects, as doing it that way indicates, they claim, that a buyer is "serious" and genuinely committed to making a purchase.
So you see, the response requested is indicated in the very form and name of the document itself. The Letter of Intent has no established place in International trade law. Where they are used _ rarely _ is in some small niche internal markets and trades. The RFQ, Request for Quotation, a standard protocol in the business world, is what most brokers actually want when they err in using an LOI.