三、生产项目组合的边际分析 (-)生产项目间的相互关系 Product-product relationships Complementary -e.g. winter wheat and spring rape .Broadly competitive -e.g. winter barley and winter wheat, beef and Sheep Closely competitive-eg. milling wheat and feed wheat Supplementary -e.g. Xmas turkeys on an arable farm pigs on an organic arable farm三、生产项目组合的边际分析 （一）生产项目间的相互关系 Product - product relationships •Complementary - e.g. winter wheat and spring rape •Broadly competitive - e.g. winter barley and winter wheat, beef and sheep •Closely competitive - e.g. milling wheat and feed wheat •Supplementary - e.g. Xmas turkeys on an arable farm, pigs on an organic arable farm