Electrum was used in Greece. It was thing which reacts in friction and cause electricity. Die stamp is a method of forming a metal sheet into desired shape. These electrum and die stamp was a form of currency in ancient world. the then people learn to barter system and exchanging facilities from the introduction of these currencies.
Step-by-step explanation:
Electrum and die stamps are metal currency and a sheet of thin metal paper which produce electricity when gets friction. The inhabitants of ancient world were benefited by the use of electrum as it was used in the production of electricity. At that time they were not familiar with the advantage of electricity.
Die stamp is a metal sheet of paper was used as a currency. It was medium of barter system and was useful for exchanging facilities. People learn to give currency in return of receiving product from others.