Quantity, quality, availability and economics are the key factors that affect the marketing of a crop or crop product, irrespective whether it is for the domestic, national or international market. Obviously the purchaser will require the product to be available at the time required and for it to be of the desired quantity and quality. While the domestic market may permit some flexibility, where further processing or national and international markets are involved there can be no such flexibility. A processing plant will require a steady supply in order to keep the plant working efficiently throughout the year or season. Importers likewise require a steady supply, if not they will seek supplies elsewhere or find substitutes.