The desire of interested parties to "discover" the value of certain grains in the future is one of the reasons for the evolvement of the first futures markets at the fledgling Chicago Board of Trade in the mid-19th century. Now of course, there are futures markets representing a dizzying array of commodities.Last week in this column, we commented about commodity prices and how they tend to move in cycles that reflect the balances between supplies of the physical commodities in relation to demand for the same. Many micro or macro factors can and often do influence commodity prices. Ultimately, though, it is the perceived or predicted changes in that fundamental balance between supply and demand that drive commodity prices up or down accordin...