Fractional Reserve Banking Quiz: How Banks Create Money

Fractional reserve banking is a system where banks retain only a fraction of total deposits as required reserves and lend out the remainder to borrowers. This practice allows banks to create credit and expand the money supply beyond the original amount deposited, forming the foundation of how modern banking systems generate economic activity.

The correct answer is False. Fractional reserve banking specifically means banks keep only a fraction of deposits in reserve, not the full amount. This fraction is set by the reserve requirement. Banks lend out the surplus beyond their required reserves, which is the mechanism that allows money creation and credit expansion throughout the broader financial system.

With a 20 percent reserve requirement, the bank must hold 20 percent of the $500 deposit, which equals $100 in required reserves. The remaining $400 represents excess reserves available for lending. This portion becomes the basis for a new loan, which when deposited elsewhere, can trigger another round of credit creation in the banking system.

The money multiplier measures how much the money supply can theoretically expand from a single initial deposit. It is calculated by dividing 1 by the reserve requirement ratio. For example, with a 10 percent reserve requirement, the multiplier is 10, meaning each dollar deposited could ultimately support up to ten dollars in total deposits across the banking system through successive rounds of lending.

The correct answer is True. Under fractional reserve banking, each deposit can be partially re-lent, and each resulting loan becomes a new deposit that can again be partially lent. This chain of deposits and loans means that the total money supply, measured by all deposits across the system, substantially exceeds the amount of physical currency that originally entered circulation.

The reserve requirement is the minimum fraction of deposits that a bank must hold as reserves and is not permitted to lend out. It is set by the central bank to ensure banks maintain sufficient liquidity to meet everyday withdrawal demands. The portion of deposits beyond this required minimum forms the pool of funds available for new loans and credit creation.

When the reserve requirement is lowered, banks are required to hold a smaller fraction of each deposit as reserves, leaving a larger share available for lending. This amplifies the credit creation process because more of each deposit flows into new loans, which become new deposits, enabling further rounds of lending and a greater overall expansion of the money supply.

This is the core mechanism of fractional reserve banking. When a borrower deposits their loan into another bank, that bank treats it as a new deposit and can lend out the portion beyond its reserve requirement. This process repeats across the banking system, creating multiple rounds of deposits and loans that collectively expand the total money supply well beyond the original deposit amount.

Fractional reserve banking creates a potential vulnerability because banks hold only a fraction of deposits in cash. If a large number of depositors try to withdraw simultaneously, often called a bank run, the bank may not have enough liquid funds to meet all demands. This risk is a key reason why central banks act as lenders of last resort and why deposit insurance exists.

In a fractional reserve system, banks hold only a fraction of deposits as reserves, the money supply expands through repeated lending and deposit cycles, and the reserve requirement sets the minimum amount that must be held back. Banks do not lend to reduce the money supply. Lending expands it, while loan repayment contracts it.

Raising the reserve requirement forces banks to retain a larger share of every deposit, reducing the funds available for lending. With less money flowing into new loans, fewer new deposits are created, and the credit creation process slows. The overall result is a contraction of the money supply, which is one reason central banks raise reserve requirements when they want to reduce inflationary pressure.

The correct answer is False. Fractional reserve banking works in the opposite way. Banks keep only a small fraction of deposits as required reserves and lend out the majority. For example, with a 10 percent reserve requirement, a bank retains just 10 cents of every dollar deposited and is free to lend the remaining 90 cents, making the lending portion the dominant use of deposited funds.

The money multiplier effect occurs when an initial deposit triggers a chain of successive deposits and loans throughout the banking system. Each bank lends out the portion beyond its reserve requirement, that amount is deposited elsewhere, and the cycle repeats. A single $1,000 deposit can ultimately support a much larger total expansion of deposits, illustrating how fractional reserve banking multiplies the original amount.

Banks prefer to lend out their excess reserves because loans generate interest income, which is the primary source of bank revenue. Idle reserves sitting at the central bank earn little or nothing. By actively deploying excess reserves as loans, banks maximize their profitability. This incentive to lend is a central reason why fractional reserve banking naturally leads to credit creation and money supply expansion.

When a borrower repays a loan, the deposit that was created when the loan was originally made is effectively cancelled. Since that deposit added to the money supply when the loan was issued, its elimination when the loan is repaid contracts the money supply by an equivalent amount. This symmetry between loan creation and repayment is fundamental to understanding how banking activity shapes the total stock of money in the economy.