n the 19th century, gold and silver coins were a common currency used as medium of exchange between individuals transacting directly between each other. Although paper money became a convenient way to carry and use as medium of exchange, gold and silver coins were given priority for their trust and safety. Equivalently, not all individuals trusted banks for storing their gold and silver. The combination of bank robberies and bank runs contributed in making individuals weary of storing all of their wealth at the same bank. Many rather preferred to implement a strategy of diversification by being the client of several banks and storing some of their wealth (gold and silver) themselves.