[Index]

Fractional-reserve banking

Taken from: Wikipedia - Fractional-reserve banking



Introduction


Fractional-reserve banking is the banking practice in which banks keep only a fraction of their deposits in reserve (as cash and other highly liquid assets) and lend out the remainder, while maintaining the simultaneous obligation to redeem all these deposits upon demand. Fractional reserve banking necessarily occurs when banks lend out any fraction of the funds received from demand deposits. This practice is universal in modern banking.

By its nature, the practice of fractional reserve banking expands money supply (cash and demand deposits) beyond what it would otherwise be. Because of the prevalence of fractional reserve banking, the broad money supply of most countries are a multiple larger than the amount of base money created by the country's central bank. That multiple (called the money multiplier) is determined by the reserve requirement or other financial ratio requirements imposed by financial regulators.

Central banks generally mandate reserve requirements that require banks to keep a minimum fraction of their demand deposits as cash reserves. This both limits the amount of money creation that occurs in the commercial banking system, and ensures that banks have enough ready cash to meet normal demand for withdrawals. Problems can arise, however, when a large number of depositors seek withdrawal of their deposits, which can cause a bank run or, in extreme cases, a systemic crisis. To mitigate these problems, central banks (or other government institutions) generally regulate and oversee commercial banks, act as lender of last resort to commercial banks, and also insure the deposits of the commercial banks' customers.



History


Prior to the 1800s, savers looking to keep their valuables in safekeeping depositories deposited gold coins and silver coins at goldsmiths, receiving in turn a note for their deposit (see Bank of Amsterdam). Once these notes became a trusted medium of exchange an early form of paper money was born, in the form of the goldsmiths' notes.

As the notes were used directly in trade, the goldsmiths observed that people would not usually redeem all their notes at the same time, and they saw the opportunity to invest their coin reserves in interest-bearing loans and bills. This generated income for the goldsmiths but left them with more notes on issue than reserves to pay them with. A process was started that altered the role of the goldsmiths from passive guardians of bullion, charging fees for safe storage, to interest-paying and interest-earning banks. Thus fractional-reserve banking was born.

However, if creditors (note holders of gold originally deposited) lost faith in the ability of a bank to redeem (pay) their notes, many would try to redeem their notes at the same time. If in response a bank could not raise enough funds by calling in loans or selling bills, it either went into insolvency or defaulted on its notes. Such a situation is called a bank run and caused the demise of many early banks.



How it works


The nature of modern banking is such that the cash reserves at the bank available to repay demand deposits need only be a fraction of the demand deposits owed to depositors. In most legal systems, a demand deposit at a bank (e.g. a checking or savings account) is considered a loan to the bank (instead of a bailment) repayable on demand, that the bank can use to finance its investments in loans and interest bearing securities. Banks make a profit based on the difference between the interest they charge on the loans they make, and the interest they pay to their depositors. Since a bank lends out most of the money deposited, keeping only a fraction of the total as reserves, it necessarily has less money than the account balances of its depositors.

The main reason customers deposit funds at a bank is to store savings in the form of a demand claim on the bank. Depositors still have a claim to full repayment of their funds on demand even though most of the funds have already been invested by the bank in interest bearing loans and securities. Holders of demand deposits can withdraw all of their deposits at any time. If all the depositors of a bank did so at the same time a bank run would occur, and the bank would likely collapse. Due to the practice of central banking this is a rare event today, as central banks usually guarantee the deposits at commercial banks, and act as lender of last resort when there is a run on a bank. However, there have been some recent bank runs, the Northern Rock crisis of 2007 in the United Kingdom is an example. The collapse of Washington Mutual bank in September 2008, the largest bank failure in history, was preceded by a "silent run" on the bank, where depositors removed vast sums of money from the bank through electronic transfer.[citation needed] However, in these cases, the banks proved to have been insolvent at the time of the run. Thus, the bank runs merely precipitated failures that were inevitable in any case.

In the absence of crises that trigger bank runs, fractional-reserve banking usually functions smoothly because at any one time relatively few depositors will make cash withdrawals simultaneously compared to the total amount on deposit, and a cash reserve can be maintained as a buffer to deal with the normal cash demands from depositors seeking withdrawals. In addition, in a normal economic environment, cash is steadily being introduced into the economy by the central bank, and new funds are steadily being deposited into the commercial banks.

However, if a bank is experiencing a financial crisis, and net redemption demands are unusually large over a period of time, the bank will run low on cash reserves and will be forced to raise additional funds to avoid running out of reserves and defaulting on its obligations. A bank can raise funds from additional borrowings (e.g. by borrowing from the money market or using lines of credit held with other banks), or by selling assets, or by calling in short-term loans. If creditors are afraid that the bank is running out of cash or is insolvent, they have an incentive to redeem their deposits as soon as possible before other depositors access the remaining cash reserves before they do, triggering a cascading crisis that can result in a full-scale bank run.



Money creation


Modern central banking allows multiple banks to practice fractional reserve banking with inter-bank business transactions without risking bankruptcy. The process of fractional-reserve banking has a cumulative effect of money creation by banks, essentially expanding the money supply of the economy.

There are two types of money in a fractional-reserve banking system operating with a central bank:
- central bank money (money created or adopted by the central bank regardless of its form (precious metals, commodity certificates, banknotes, coins, electronic money loaned to commercial banks, or anything else the central bank chooses as its form of money);
- commercial bank money (demand deposits in the commercial banking system) - sometimes referred to as chequebook money When a deposit of central bank money is made at a commercial bank, the central bank money is removed for circulation, and an equal amount of new commercial bank money is created. When a loan is made using the central bank money from the commercial bank (which keeps only a fraction of the central bank money as reserves), the money supply expands by the size of the loan.

The following example shows how loans are funded and how the money supply is affected. It also shows how central bank money is used to create commercial bank money from an initial deposit of $100 of central bank money. In the example, the initial deposit is lent out 10 times with a fractional-reserve rate of 20% to ultimately create $400 of commercial bank money. Each bank involved in this process creates new commercial bank money on only a portion of the original deposit of central bank money, ensuring that it always has enough reserves on hand to meet the inter-bank business demands, and also ensuring that multiple banks participate in the inflation process so that all banks are inflating at the same rate.

The process begins when an initial $100 deposit of central bank money is made into Bank A. Bank A then takes 20 percent of it, or $20, and sets it aside as reserves and then loans out the remaining 80 percent, or $80. At this point there is actually a total of $180 in the system, not $100; because the bank has loaned out $80 of the central bank money, kept $20 of central bank money in reserve, and substituted a newly created $80 IOU claim for the depositor that acts equivalent to and can be implicitly redeemed for central bank money (the depositor can transfer it to another account, write a check on it, etc.). These checkbook IOUs are termed commercial bank money and are simply recorded in a bank's register as an asset (specifically, an IOU from the loan recipient) next to the reserves. From a depositor's perspective, commercial money is central bank money--it's impossible to tell the two forms of money apart until a bank run happens (at which time everyone wants central bank money). At this point Bank A still holds $100 of central bank money reserves on its books, but $80 of those reserves are soon going to be needed to satisfy the loan recipient. The loan recipient soon spends the $80. The receiver of that $80 then deposits it into Bank B. Bank B demands $80 of central bank money be delivered from Bank A to Bank B in satisfaction of the loan recipient's check. Bank A now only has $20 of central bank money on its books.

Bank B is now in the same situation as Bank A started with, except it has a deposit of $80 of central bank money instead of $100. Similar to Bank A, Bank B sets aside 20 percent of that $80, or $16, as reserves and lends out the remaining $64, creating $64 of IOUs to its depositors. As the process continues, more commercial bank money is created. To simplify the table, a different bank is used for each deposit. In the real world, the money a bank lends may end up in the same bank so it then has more money to lend out.

Individual Bank	Amount Deposited	Lent Out	Reserves
A	100	80	20
B	80	64	16
C	64	51.20	12.80
D	51.20	40.96	10.24
E	40.96	32.77	8.19
F	32.77	26.21	6.55
G	26.21	20.97	5.24
H	20.97	16.78	4.19
I	16.78	13.42	3.36
J	13.42	10.74	2.68
K	10.74
			Total Reserves:
			89.26
	Total Amount Deposited:	Total Amount Lent Out:	Total Reserves + Last Amount Deposited:
	457.05	357.05	100
	Commercial Bank Money Created + Central Bank Money:	Commercial Bank Money Created:	Central Bank Money:
	457.05	357.05	100

Although no new money was physically created in addition to the initial $100 deposit, new commercial bank money is created through loans. The 2 boxes marked in red show the location of the original $100 deposit throughout the entire process. The total reserves plus the last deposit (or last loan, whichever is last) will always equal the original amount, which in this case is $100. As this process continues, more commercial bank money is created. The amounts in each step decrease towards a limit. If a graph is made showing the accumulation of deposits, one can see that the graph is curved and approaches a limit. This limit is the maximum amount of money that can be created with a given reserve rate. When the reserve rate is 20%, as in the example above, the maximum amount of total deposits that can be created is $500 and the maximum amount of commercial bank money that can be created is $400.

For an individual bank, the deposit is considered a liability whereas the loan it gives out and the reserves are considered assets. The deposit will always be equal to the loan plus the reserve, since the loan and reserve are created from the deposit. This is the basis for a bank's balance sheet.

The creation and destruction of commercial bank money occurs through this process. Whether it is created or destroyed depends on what direction the process moves. When loans are given out, the process moves from the top down and money is created. When loans are paid back, the process moves from the bottom to the top and commercial bank money is canceled out, effectively erasing it from existence.

This table gives an outline of the makeup of money supplies worldwide. Most of the money in any given money supply consists of commercial bank money. The value of commercial bank money comes from the fact that it can be exchanged at a bank for central bank money.

This is a general outline of how it works. The actual increase in the money supply through this process may be lower, as (at each step) banks may choose to hold reserves in excess of the statutory minimum, borrowers may let some funds sit idle, and some borrowers may choose to hold cash, and there may be delays or frictions in the process. It may also be higher if the reserve requirement is lower or if there are no reserve requirements. Government regulations may also be used to limit the money creation process by preventing banks from giving out loans even though the reserve requirements have been fulfilled.


Reserve requirements

The reserve requirements are intended to prevent banks from:
- generating too much money by making too many loans against the narrow money deposit base;
- having a shortage of cash when large deposits are withdrawn (although the reserve is a legal minimum, it is understood that in a crisis or bank run, reserves may be made available on a temporary basis).

The money creation process is affected by the currency drain ratio (the propensity of the public to hold banknotes rather than deposit them with a commercial bank), and the safety reserve ratio (excess reserves beyond the legal requirement that commercial banks voluntarily hold—usually a small amount). Data for "excess" reserves and vault cash are published regularly by the Federal Reserve in the United States. In practice, the actual money multiplier varies over time, and may be substantially lower than the theoretical maximum.

For more information, see: Wikipedia - Fractional-reserve banking