All  

barter

Production of salt for the salt trade.

When Salt Was Traded for Gold: The Salt Trade of West Africa that Built Kingdoms and Spread Culture

In West Africa during the Medieval period, salt was traded for gold. This may seem astonishing as salt is a cheap commodity in today’s society. It may be added that salt is easily available today...
Barter, Bills and Banknotes: The 5,000 Year History of Money

From Barter to Bitcoins: The 5,000 Year History of Money

Money has come a long way in 5,000 years. While people once bartered for the items they desired, today people are buying and trading in cryptocurrencies like the bitcoin. In ancient times, people did...