by James Grant
Daily Reckoning
Before the Renaissance, world money existed as precious metal coins or bullion. Caesars and kings hoarded gold and silver, dispensed it to their troops, fought over it, and stole it from each other. Land has been another form of wealth since antiquity. Still, land is not money because, unlike gold and silver, it cannot easily be exchanged, and has no uniform grade.
In the fourteenth century, Florentine bankers (called that because they worked on a bench or banco in the piazzas of Florence and other city states), accepted deposits of gold and silver in exchange for notes which were a promise to return the gold and silver on demand.