Currency Deposit Ratio Impact Quiz: Cash Holding Effect

The currency deposit ratio measures the public's preference for holding money as physical cash relative to bank deposits. If the ratio is high, people prefer cash; if low, they prefer deposits. This preference matters for money supply determination because money held as deposits can be lent and re-lent through the banking system, multiplying the money supply, while cash held outside banks does not cycle through the credit creation process.

When the currency deposit ratio rises, more of the money supply is held as physical cash outside banks rather than as deposits. Cash held outside banks cannot be lent by commercial banks, so it does not cycle through the credit creation process. This reduces the effective money multiplier because fewer funds flow back into the banking system as deposits after each spending cycle, limiting the number of successive rounds of lending and deposit creation that multiply the monetary base.

The banking system creates money through repeated cycles of lending and re-depositing. Each time money is lent and spent, the recipient deposits it in a bank, which can then lend a portion again. When people hold more cash rather than depositing, this cycle is interrupted. Less money returns to banks as deposits, reducing the base for further lending. With each round of the multiplier weakened, the total expansion of the money supply from any given level of reserves is smaller.

The currency deposit ratio typically rises when confidence in the banking system falls. During financial crises or bank failures, households prefer holding physical cash because they fear bank deposits may be inaccessible or at risk. This flight to cash raises the currency deposit ratio, drains deposits from the banking system, reduces the reserve base available for lending, compresses the money multiplier, and can cause a significant contraction of the broader money supply even without any change in central bank policy.

A rising currency deposit ratio reduces deposits in the banking system, which shrinks the base for loan creation and compresses the multiplier. It also weakens the transmission of monetary policy because reserve injections are less effective when more money leaks out of the banking cycle as cash. Holding more physical cash does not expand the money supply because the total monetary base is unchanged; it simply shifts the composition away from bank-created deposit money toward currency in circulation.

The answer is True. When a banking crisis triggers a shift from deposits to cash, the currency deposit ratio rises without any central bank action. Deposits leaving the banking system reduce the reserve base available for lending, compress the money multiplier, and contract the broad money supply. The central bank must inject additional reserves or take other action just to offset the contractionary effect of this behavioral shift, let alone to expand the money supply.

In the extended money multiplier formula, the currency deposit ratio affects both the numerator, where it appears as part of the money supply definition, and the denominator, where it reduces the multiplier by capturing how much money leaks from the deposit creation cycle as cash holdings. A higher currency deposit ratio in the denominator means more leakage per round of the multiplier, producing a lower overall multiplier and therefore a smaller broad money supply relative to the monetary base.

If a rising currency deposit ratio is contracting the money supply, the central bank can inject additional reserves through open market purchases to compensate. By increasing the reserve base, the central bank offsets the reduced multiplier effect caused by the currency drain. This allows the banking system to maintain its total deposit creation capacity even with fewer deposits cycling through the system per round, stabilizing the broad money supply at or near its prior level.

The answer is True. When digital payment systems are prevalent and consumers rarely need physical cash, the currency deposit ratio is low because most money remains in the banking system as deposits rather than being withdrawn as currency. More money cycling through bank deposits means more successive rounds of lending and re-depositing, producing a higher effective money multiplier. Highly digitized payment economies therefore tend to have a more efficient money creation process from any given monetary base.

The currency deposit ratio moves with economic confidence. When the banking system is trusted, households keep money in deposits, driving the ratio down and supporting a larger money multiplier and broader money supply. When banks are perceived as risky, households withdraw cash, raising the ratio, compressing the multiplier, and contracting broad money. This procyclical behavior amplifies economic fluctuations: the money supply tends to expand during booms and contract during crises partly due to shifts in cash preference.

As digital payments displace physical cash, fewer funds leak out of the banking cycle as currency. More money stays in the form of bank deposits, cycling through successive rounds of lending and re-depositing. This structural decline in the currency deposit ratio increases the effective money multiplier over time. Central banks must account for this trend when calibrating the monetary base because a given base now supports a larger money supply than it would have in a more cash-intensive era.

When a household starts withdrawing more cash, a larger fraction of money leaves the banking deposit pool. Banks receive fewer deposits, reducing the reserves and deposit base available for lending. With less deposit money cycling through the system, the banking system creates fewer additional deposits per round of the multiplier. Over time, if many households shift toward cash, the aggregate effect is a lower effective money multiplier and a smaller total money supply relative to what the same monetary base would otherwise support.

The answer is False. The currency deposit ratio is shaped primarily by household behavior and economic conditions rather than directly by the central bank. Public preferences for cash versus deposits, confidence in the banking system, access to digital payments, and economic uncertainty all influence whether people hold money as currency or deposits. The central bank can respond to changes in this ratio but does not set it directly. This makes the currency deposit ratio one of the key behavioral variables outside central bank control that affects money supply outcomes.

The reserve ratio and currency deposit ratio are distinct determinants of the money multiplier. The reserve ratio is a regulatory parameter set by the central bank that determines how much of each deposit banks must retain. The currency deposit ratio reflects the voluntary behavior of the public in choosing cash versus deposits. Both reduce the multiplier when they rise, but through different channels: the reserve ratio by constraining bank lending per deposit received, and the currency deposit ratio by reducing the volume of deposits that cycle through the banking system.

When the currency deposit ratio rises sharply during a crisis, households are withdrawing deposits as cash, draining the pool of bank deposits even as the central bank adds reserves. The reserve injection expands the base, but the rising currency drain simultaneously reduces the multiplier, meaning the net effect on broader money aggregates is smaller than the size of the base expansion alone would indicate. This dynamic helps explain why large reserve injections during crises sometimes produce only modest broad money supply responses.