Browse Economics

Reserve Ratio: The Fraction of Deposits Banks Must Hold as Reserves

Explore the significance, history, types, key events, and detailed explanations

The reserve ratio is a pivotal concept in banking and financial regulation. It refers to the fraction of customer deposits that banks are required to keep in reserve and not lend out. This reserve is kept either in the bank’s vault or at the central bank.

Types/Categories of Reserve Ratio

  • Required Reserve Ratio: This is mandated by central banking authorities.
  • Excess Reserve Ratio: This refers to reserves held by banks that exceed the required minimum.

Importance

The reserve ratio ensures that banks maintain a buffer to meet customer withdrawal demands, thereby fostering financial stability and confidence in the banking system. It is a crucial tool for central banks to control money supply and implement monetary policy.

Mathematical Formula

$$ \text{Reserve Ratio (RR)} = \frac{\text{Required Reserves}}{\text{Total Deposits}} $$

Example Calculation

If a bank has $100 million in customer deposits and the reserve ratio is set at 10%, the bank must hold $10 million in reserves.

  • Liquidity: The ability of an asset to be converted into cash quickly.
  • Monetary Policy: Actions by a central bank to control the supply of money and interest rates.
  • Capital Requirements: Regulations that dictate the minimum capital a bank must hold relative to its assets.

FAQs

What happens if a bank fails to meet the reserve ratio?

It may face penalties from the central bank or be required to borrow reserves at a higher cost.

How does the reserve ratio affect the economy?

By influencing lending capacity, the reserve ratio impacts money supply and, consequently, economic activity.
Revised on Monday, May 18, 2026