Banks in the economy

Role in the money supply

A bank raises funds by attracting deposits, borrowing money in the inter-bank market, or issuing financial instruments in the money market or a capital market. The bank then lends out most of these funds to borrowers.

However, it would not be prudent for a bank to lend out all of its balance sheet. It must keep a certain proportion of its funds in reserve so that it can repay depositors who withdraw their deposits. Bank reserves are typically kept in the form of a deposit with a central bank. This behaviour is called fractional-reserve banking and it is a central issue of monetary policy. Some governments (or their central banks) restrict the proportion of a bank's balance sheet that can be lent out, and use this as a tool for controlling the money supply. Even where the reserve ratio is not controlled by the government, a minimum figure will still be set by regulatory authorities as part of bank regulation.

Size of global banking industry

Worldwide assets of the largest 1,000 banks grew 15.5% in 2005 to reach a record $60.5 trillion. This follows a 19.3% increase in the previous year. EU banks held the largest share, 50% at the end of 2005, up from 38% a decade earlier. The growth in Europe’s share was mostly at the expense of Japanese banks whose share more than halved during this period from 33% to 13%. The share of US banks also rose, from 10% to 14%. Most of the remainder was from other Asian and European countries.

The US had by far the most banks (7,540 at end-2005) and branches (75,000) in the world. The large number of banks in the US is an indicator of its geographical dispersity and regulatory structure resulting in a large number of small to medium sized institutions in its banking system. Japan had 129 banks and 12,000 branches. In 2004, Germany, France, and Italy had more than 30,000 branches each—more than double the 15,000 branches in the UK.

Bank crises

Banks are susceptible to many forms of risk which have triggered occasional systemic crises. Risks include liquidity risk (the risk that many depositors will request withdrawals beyond available funds), credit risk (the risk that those that owe money to the bank will not repay), and interest rate risk (the risk that the bank will become unprofitable if rising interest rates force it to pay relatively more on its deposits than it receives on its loans), among others.

Banking crises have developed many times throughout history when one or more risks materialize for a banking sector as a whole. Prominent examples include the U.S. Savings and Loan crisis in 1980s and early 1990s, the Japanese banking crisis during the 1990s, the bank run that occurred during the Great Depression, and the recent liquidation by the central Bank of Nigeria, where about 25 banks were liquidated.

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