One might say that grain and soy futures markets are a function of relative sizes.  Fundamentally, their prices are moved by how big or small crop production may be, by how large or how limited demand may be and by the size of each year’s ending stocks. Said another way, the fundamental supply and demand factors that set up futures market price movement and direction each crop cycle are ultimately measured by size.  Of course, there are a myriad of different elements that work to determine the size of each crop, the amount of demand for crops, ending stocks and the like. The sizes involved are seldom viewed as absolutes. More often they are compared to the past history of the same set of sizes. By itself a 16 billion bu U.S...