List of oldest banks in continuous operation
Depending on the definition, the world's oldest bank is either Banca Monte dei Paschi di Siena or Berenberg Bank. Banca Monte dei Paschi di Siena was founded in its present form in 1624, but traces its history to a mount of piety founded in 1472. The Berenberg company was founded in 1590 and has operated continuously ever since with the same family as owners or major co-owners. Banca Monte dei Paschi di Siena is today a large Italian retail bank, while Berenberg Bank is primarily involved in investment banking and private banking for wealthy customers; in any event Berenberg Bank is the world's oldest merchant bank or investment bank. The world's oldest central bank is the Sveriges Riksbank, which was founded in 1668.
Fractional-reserve banking
The Swedish Riksbank was the world's first central bank, created in 1668. Many nations followed suit in the late 1600s to establish central banks which were given the legal power to set the reserve requirement, and to specify the form in which such assets (called the monetary base) are required to be held. In order to mitigate the impact of bank failures and financial crises, central banks were also granted the authority to centralize banks' storage of precious metal reserves, thereby facilitating transfer of gold in the event of bank runs, to regulate commercial banks, impose reserve requirements, and to act as lender-of-last-resort if any bank faced a bank run. The emergence of central banks reduced the risk of bank runs which is inherent in fractional-reserve banking, and it allowed the practice to continue as it does today.