For those that believe that traders and speculators produce 'nothing of value' the CME group has a very good short video clip showing quite the contrary.
HOW FOOD GOES FROM FARM TO MARKET
Elaine Kub puts it beautifully in her book Mastering the Grain Markets:
"No other industry is so fundamentally tied to our human nature. It is creative in the truest sense of the word-by growing plants we create and sustain life. And no other industry ties the global population together so inescapably. All life on earth depends on agriculture, how well we distribute agriculture's products-how well we trade grain-determines how Earth's population gains access to its most fundamental needs."
See also: Mastering Metrics and Mastering the Grain Markets.