I think there is 250,000 Tons of gold in this world (not sure). Each world trade center building had 100,000 or 200,000 Tons of steel. Now imagine the steel in this world. There is a little bit of steel in everybody's life. There are millions of other products, goods, metals (world business/trade) Maybe that is the reason gold is not used as money because there is not enough gold in this world to support the world business/trade. Correct me if I am wrong. Just my thought.