During the past several years we have occasionally discussed the grouping together of different commodities such as crude oil, corn, copper, softs, etc. into a single trading instrument, or to use a popular term, an "asset class."  This has been a relatively new concept that really began in the 1990s (we consider that relatively new), and expanded greatly during the last decade.  The concept was promoted by those trying to sell investors on participation in index funds.  But it really gained credence when prominent financial institutions and investment entities such as hedge funds, pension funds, foundations and university endowments began to add commodities to their portfolios to diversify the scope of their investments.&n...