Quality standards established by AMS Livestock, Poultry, and Seed Program help facilitate the marketing of poultry, rabbits, and shell eggs among buyers and sellers. Standards allow buyers and sellers to specify the level of quality required or expected for a product without having to see or examine products in advance. Buyers and sellers often refer to U.S. standards in their trading specifications and contracts (e.g., "Product must meet U.S. Grade A requirements").