The validity period on a quotation is not a formality; it states the assumptions the price rests on. Under Article 3 of the Turkish Code of Obligations, an offeror who sets a period for acceptance is bound until it ends and is released if acceptance has not arrived by then. If your approval calendar runs past the period, you cannot rely on the old price.
The currency arrangement in the quotation decides who carries the exchange-rate movement. On a foreign-currency price paid in that currency the buyer carries it, on a fixed local-currency price the seller does, and on a rate-indexed price it is shared by formula. A hypothetical example: a EUR 10,000 price at a rate of 40 is TRY 400,000, and if the rate reaches 44 on the payment day the same invoice becomes TRY 440,000. Under Article 99, unless the contract requires payment in the foreign currency itself, a foreign-currency debt may also be paid in lira at the rate on the payment day.
The buyer has three routes: fit the decision inside the period, have the price fixed at a stated rate in writing, or split the order so each lot carries its own price. If a long validity is requested, the seller passes that risk into the price. An expired quotation can be renewed, though the price may change; when you ask for renewal, quote the date and content of the original. Production and shipping time are separate from the life of the price.
