Did you know only people involved in physical trading were allowed to trade in commodities before 1999?
http://af.reuters.com/article/topNews/idAFJOE7120OE20110203?pageNumber=1&virtualBrandChannel=0
http://af.reuters.com/article/topNews/idAFJOE7120OE20110203?pageNumber=1&virtualBrandChannel=0