History of stock exchange

Tradable bonds as a commonly used type of security were a more recent innovation, spearheaded by the Italian city-states of the late medieval and early Renaissance periods.
In 1171, the authorities of the Republic of Venice, concerned about their war-depleted treasury, drew a forced loan from the citizenry. Such debt, known as prestiti, paid 5 percent interest per year and had an indefinite maturity date. Initially regarded with suspicion, it came to be seen as a valuable investment that could be bought and sold. The bond market had begun.
From 1262 to 1379, Venice never missed an interest payment, solidifying the credibility of the new instruments. Other Italian city-states such as Florence and Genoa became bond issuers as well, often as a means of paying for warfare. Bonds were traded widely in Italy and beyond, a business facilitated by bankers such as the Medicis.