Gold has always had value to humans, even before it was money. This is demonstrated by the extraordinary efforts made to obtain it. Prospecting for gold was a worldwide effort going back thousands of years, even before the first money in the form of gold coins appeared about 700 B.C. In the quest for gold by the Phoenicians, Egyptians, Indians, Hittites, Chinese, and others, prisoners of war were sent to work the mines, as were slaves and criminals. And this happened during a time when gold had no value as 'money,' but was just considered a desirable commodity in and of itself. A monetary standard made the world economy possible. The concept of money, (i.e., gold and silver in standard weight and fineness coins) allowed the World's economies to expand and prosper. During the Classic period of Greek and Roman rule in the western world, gold and silver both flowed to India for spices, and to China for silk. At the height of the Empire (A.D. 98-160), Roman gold and silver coins reigned from Britain to North Africa and Egypt.Money had been invented. Its name was gold.