Supply/demand analyses require a considerable amount of subjectivity and guesswork, while prices and price changes are facts. All of this leads us to consider of what may have occurred to trigger the current market rally. If someone not following markets on a daily basis casually glanced at a grain/soy futures market screen at about 11:30 a.m. (EDT) this morning, he or she might have thought that U.S. and/or world crops were in big trouble or that some major unexpected source of demand had just surfaced. Soybean futures were up more than 25 cents, soymeal was up more than $10, corn was 5-6 cents higher, and Chicago wheat was up about 13 cents. Across-the-board price jumps like these frequently signal that key fundamental changes in supply/d...