(A commodity is a product like wool or coal. A commodity broker is the middle person who asks if they want a product. Then the broker goes to the producer and the producer tells the broker a price. If the price is $25.00, the broker will sell it for $30.00 and he or she will get the extra $5.00. But if the buyer says that it is too much the broker will say "ok, $28.00" and he will get the extra $3.00.)