For most of the last 10 years it seems as though the U.S. supply and demand balance for either corn or soybeans has been deemed to have been "tight." Of course, "tight" is a relative term. What constitutes a "tight" supply and demand balance is always loosely defined. It tends to be in the eye of the beholder. Often the adequacy of corn and soybean supplies is measured by the arithmetic ratio between estimated supplies and estimated demand. Based on USDA's estimates, ending stocks of U.S. corn and soybeans for the last three years measured as a percentage of demand and the number of days of use covered by ending stocks are as follows:A combination of crop production that was mediocre or worse and steadily rising demand has resulted in rel...