Whether it’s the dollar, pound, rouble, rupee, euro or yuan, physical or digital, our entire world is built on currency exchange. But from barter, banknote to bitcoin, the means of exchange have evolved significantly. Let’s have a look.
9000 B.C.: Barter begins
Bartering was first recorded in Egypt in 9000 B.C., when farmers would go to market to exchange cows for sheep, with grains passing through the hands of harvesters in exchange for oils.
http://techcrunch.com/2016/01/21/barter-to-bitcoin-a-story-of-money-and-blockchain/#.h1wyzod:QwYH
