The banks are required to maintain a certain ratio between their cash in hand and total assets. This is called

1. Core Functions of the Reserve Bank of India (RBI) (basic)

Welcome to your first step in mastering India's monetary landscape! To understand how the economy breathes, we must first look at its heart: the Reserve Bank of India (RBI). Established on April 1, 1935, following the recommendations of the Hilton Young Commission, the RBI began as a private shareholders' company but was later nationalized to serve the public interest Nitin Singhania, Money and Banking, p.161. Its primary mandate is to maintain price stability—ensuring your money doesn't lose value too quickly—while simultaneously supporting the government's objective of economic growth Vivek Singh, Money and Banking- Part I, p.65.

The RBI wears many hats, but two are foundational. First, it is the Issuer of Currency. Under the RBI Act of 1934, it has the sole right to issue banknotes (up to denominations of ₹10,000!), while the government handles coins under the Coinage Act of 1906 Nitin Singhania, Money and Banking, p.163. Second, it acts as the Banker to Banks. Just as you keep a savings account at a commercial bank, those banks keep accounts with the RBI. This allows the RBI to monitor their health, settle transfers between different banks, and ensure they maintain statutory reserves like the Cash Reserve Ratio (CRR) Vivek Singh, Money and Banking- Part I, p.69.

One of the most critical "emergency" roles of the RBI is serving as the Lender of Last Resort. If a bank is fundamentally healthy (solvent) but faces a sudden, temporary shortage of cash because everyone wants to withdraw at once, the RBI steps in. It provides emergency liquidity when no one else in the market will, preventing a single bank's panic from collapsing the entire financial system Vivek Singh, Money and Banking- Part I, p.69. This oversight is backed by the Banking Regulation Act of 1949, which gives the RBI the power to supervise not just banks, but also Non-Banking Financial Institutions (NBFCs) to protect the interests of everyday depositors Vivek Singh, Money and Banking- Part I, p.66.

Sources: Indian Economy, Nitin Singhania (2nd ed. 2021-22), Money and Banking, p.161, 163; Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.65, 66, 69

2. Money Supply and Liquidity Concepts (intermediate)

To understand monetary policy, we must first understand what Money Supply actually is. In simple terms, money supply is a stock variable—it refers to the total stock of money in circulation among the public at a specific point in time Macroeconomics NCERT class XII 2025 ed., Money and Banking, p.48. A crucial distinction to remember is that money held by the creators of money (the Government, the RBI, and the commercial banks themselves) is never treated as part of the money supply; it only counts when it is in the hands of the "public" Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.55.

The Reserve Bank of India (RBI) classifies money into different categories based on liquidity. Liquidity refers to how quickly an asset can be converted into cash without losing its value. For example, a 100-rupee note in your pocket is perfectly liquid, whereas a Fixed Deposit (Time Deposit) is less liquid because it takes time and perhaps a penalty to convert it into spendable cash. As we move from M1 to M4, the liquidity decreases, shifting the focus of the money from a medium of exchange to a store of value Indian Economy, Nitin Singhania (2nd ed. 2021-22), Money and Banking, p.159.

The RBI uses four primary measures of money supply (M1, M2, M3, and M4), though M1 and M3 are the most commonly discussed in modern policy:

Measure	Composition	Common Name
M1	Currency with Public (CU) + Demand Deposits (DD)	Narrow Money
M2	M1 + Savings deposits with Post Office savings banks	Narrow Money
M3	M1 + Net Time Deposits of commercial banks	Broad Money
M4	M3 + Total deposits with Post Office (excluding NSC)	Broad Money

Additionally, there is M0, known as Reserve Money or High-Powered Money. This includes currency in circulation plus the deposits that banks keep with the RBI Indian Economy, Nitin Singhania (2nd ed. 2021-22), Money and Banking, p.158. It is the base upon which the rest of the money supply is created. Among all these, M3 is the most widely used measure and is often referred to as "Aggregate Monetary Resources" Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.55.

Sources: Macroeconomics NCERT class XII 2025 ed., Money and Banking, p.48; Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.55; Indian Economy, Nitin Singhania (2nd ed. 2021-22), Money and Banking, p.158-159

3. Understanding Net Demand and Time Liabilities (NDTL) (intermediate)

To understand how the RBI regulates the flow of money in our economy, we must first understand the "base" it uses for its calculations. This base is known as Net Demand and Time Liabilities (NDTL). In simple terms, NDTL represents the total volume of money that a bank owes to its customers (the public), which the RBI uses to determine how much the bank must keep in reserves. It is the fundamental yardstick for tools like the Cash Reserve Ratio (CRR) and Statutory Liquidity Ratio (SLR) Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.63.

The term is broken down into three logical parts:

• Demand Liabilities: These are funds that the bank must pay back immediately upon demand. This includes your Savings Account and Current Account balances (CASA), as well as demand drafts Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.52.
• Time Liabilities: These are funds the bank is liable to pay back after a fixed period of time. Examples include Fixed Deposits (FDs), Recurring Deposits (RDs), and even gold deposits Indian Economy, Nitin Singhania (ed 2nd 2021-22), Money and Banking, p.164.
• Other Demand and Time Liabilities (ODTL): These are miscellaneous obligations, such as interest that has accrued on deposits but hasn't been paid out yet, or unpaid dividends Indian Economy, Nitin Singhania (ed 2nd 2021-22), Money and Banking, p.164.

The most critical part for a UPSC aspirant is the word "Net." Banks often place deposits with each other. If Bank A has a deposit in Bank B, counting it in both places would lead to "double counting" in the national economy. To avoid this, we calculate Total DTL and then subtract the assets of the bank held with other banks. This ensures we are only measuring the money the banking system owes to the actual public Indian Economy, Nitin Singhania (ed 2nd 2021-22), Money and Banking, p.164.

Type	Key Characteristic	Examples
Demand	Payable instantly; highly liquid.	Savings Accounts, Current Accounts.
Time	Payable after maturity; fixed tenure.	Fixed Deposits (FD), Recurring Deposits (RD).
Netting	Prevents double counting.	Subtracting inter-bank deposits.

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.52, 63; Indian Economy, Nitin Singhania (ed 2nd 2021-22), Money and Banking, p.164

4. The Liquidity Adjustment Facility (LAF): Repo and Reverse Repo (intermediate)

Imagine the banking system as a massive water tank. Sometimes there’s too much water (excess liquidity), which can lead to inflation; at other times, the tank runs dry (liquidity crunch), making it hard for businesses to get loans. The Liquidity Adjustment Facility (LAF) is the Reserve Bank of India’s (RBI) primary tool to manage these daily fluctuations. It allows Scheduled Commercial Banks to borrow money from the RBI during a crunch or park their excess funds with the RBI to earn interest. As defined in Indian Economy, Nitin Singhania (ed 2nd 2021-22), Money and Banking, p.166, the LAF operates through two main levers: Repo Rate and Reverse Repo Rate.

The Repo Rate (Repurchase Option) is the interest rate at which the RBI lends short-term money to banks against the collateral of government securities. It is called a "repurchase" agreement because the bank sells a security to the RBI with a legal promise to buy it back at a future date at a slightly higher price. Conversely, the Reverse Repo Rate is the rate at which banks park their surplus funds with the RBI. When the RBI wants to control inflation, it increases the Repo rate, making borrowing expensive for banks. This eventually trickles down to you and me as higher interest rates on home or car loans. According to Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.89, changes in these rates also impact the "call money rate" (the rate at which banks lend to each other overnight), as banks won't lend to peers for less than what they can safely earn from the RBI.

Feature	Repo Rate	Reverse Repo Rate
Action	RBI lends money to banks.	Banks park money with RBI.
Purpose	Injects liquidity into the system.	Absorbs liquidity from the system.
Collateral	Banks provide G-Secs to RBI.	RBI provides G-Secs to banks.

In modern practice, the RBI often uses a "LAF Corridor". This corridor is bounded by the Marginal Standing Facility (MSF) at the top and the Reverse Repo at the bottom, with the Repo rate acting as the central policy rate Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.62. This ensures that the market interest rates stay within a predictable range, providing stability to the entire financial system.

Sources: Indian Economy, Nitin Singhania (ed 2nd 2021-22), Money and Banking, p.166; Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.62, 89

5. Open Market Operations and Government Securities (exam-level)

Imagine the economy as a massive tank of water (money). Sometimes the water level is too high, leading to the 'overflow' of inflation; sometimes it's too low, causing the 'drought' of a slowdown. Open Market Operations (OMOs) are the primary tools the RBI uses to either pump water in or drain it out. Specifically, OMOs refer to the buying and selling of Government Securities (G-Secs) by the RBI in the open market Indian Economy, Nitin Singhania, Money and Banking, p.167. Unlike the CRR or SLR, which are regulatory ratios, OMOs are market-based interventions where the RBI acts as a participant in the secondary market.

The logic is elegant and simple: if the RBI wants to reduce the money supply (to fight inflation), it sells G-Secs. Commercial banks buy these securities, and in return, their cash balances move to the RBI. Conversely, if the economy needs more liquidity to support growth, the RBI buys G-Secs from the banks, effectively injecting fresh cash into the banking system Indian Economy, Vivek Singh, Money and Banking- Part I, p.63. These are often called 'Outright OMOs' because they are permanent transactions, unlike Repo operations which are temporary and involve an agreement to buy back the security later.

Historically, the RBI used to buy securities directly from the government to fund its deficit, but this was 'direct monetization' and was inflationary. Since the late 1990s and the FRBM Act of 2003, the RBI primarily operates in the secondary market. This ensures that the RBI uses OMOs as a tool for liquidity management and financial stability, rather than just a way to fund government spending Indian Economy, Vivek Singh, Government Budgeting, p.164. In cases where there is an overwhelming surge of cash (like during massive foreign investment inflows), the RBI may also use the Market Stabilisation Scheme (MSS), issuing special G-Secs purely to 'sterilize' or soak up that excess liquidity Indian Economy, Vivek Singh, Money and Banking- Part I, p.64.

Action by RBI	Impact on Liquidity	Economic Objective
Selling G-Secs	Liquidity Absorption (Decreases)	Control Inflation
Buying G-Secs	Liquidity Injection (Increases)	Support Economic Growth

Sources: Indian Economy, Nitin Singhania, Money and Banking, p.167; Indian Economy, Vivek Singh, Money and Banking- Part I, p.63-64; Indian Economy, Vivek Singh, Government Budgeting, p.164

6. The Monetary Policy Committee (MPC) Framework (exam-level)

For many years, the decision on India’s interest rates rested solely with the RBI Governor. However, to bring in more transparency, accountability, and a diversity of perspectives, India moved to a committee-based approach. In February 2015, a Monetary Policy Framework Agreement was signed between the Government and the RBI, which eventually led to the statutory creation of the Monetary Policy Committee (MPC) through an amendment to the RBI Act, 1934 Vivek Singh, Money and Banking- Part I, p.60.

The MPC is a six-member body tasked with determining the policy interest rate (Repo Rate) required to achieve the inflation target. It operates under a Flexible Inflation Targeting (FIT) framework, where the primary goal is to maintain price stability (keeping inflation at 4% with a margin of +/- 2%) while keeping the objective of economic growth in mind. The committee must meet at least four times a year and publish its decisions after every meeting.

The composition of the MPC is carefully balanced to ensure independence and expertise:

Member Category	Number	Specific Roles
RBI Internal Members	3	The Governor (Chairperson), a Deputy Governor, and one officer of the RBI.
External Members	3	Appointed by the Central Government for a non-renewable 4-year term.

Decisions in the MPC are made by a majority vote. Each member has one vote, but in the rare event of a tie, the RBI Governor has a second or "casting vote" to break the deadlock Nitin Singhania, Financial Market, p.249. It is important to note that unlike some other financial bodies, the Union Finance Minister does not sit on this committee; the Governor of the RBI serves as the ex-officio Chairperson.

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.60; Indian Economy, Nitin Singhania (ed 2nd 2021-22), Financial Market, p.249

7. Cash Reserve Ratio (CRR): Mechanism and Impact (intermediate)

At its heart, the Cash Reserve Ratio (CRR) is a safety and control mechanism. It represents the specific percentage of a bank's total deposits—technically called Net Demand and Time Liabilities (NDTL)—that Scheduled Commercial Banks are legally required to keep as cash reserves with the Reserve Bank of India (RBI). Unlike other tools, this money is not kept in the bank's own vaults; it is physically or electronically parked with the RBI. As per the RBI Act, 1934, the central bank has the authority to set this ratio to regulate liquidity in the economy Indian Economy, Nitin Singhania, Chapter 7, p.161.

The mechanism is a powerful lever for Monetary Policy. When the RBI wants to fight inflation, it increases the CRR. By doing so, it effectively 'locks away' more of the banks' money, leaving them with less capital to lend to consumers and businesses. Conversely, to boost economic growth during a slowdown, the RBI reduces the CRR, injecting 'liquidity' back into the banking system Indian Economy, Nitin Singhania, Chapter 7, p.168. An important nuance for your exams: the RBI does not pay any interest on these CRR balances. This makes CRR a 'cost' for banks, as that money earns zero returns while it sits with the RBI Indian Economy, Nitin Singhania, Chapter 7, p.170.

While CRR is often discussed alongside the Statutory Liquidity Ratio (SLR), they serve different operational roles. While both are reserve requirements, the following table clarifies their primary differences:

Feature	Cash Reserve Ratio (CRR)	Statutory Liquidity Ratio (SLR)
Form of Reserve	Only Cash	Cash, Gold, or Govt. Securities
Kept with...	The RBI	The Bank itself
Returns/Interest	No interest earned	Earns interest (on securities/gold)
Primary Aim	Control liquidity/inflation	Ensure bank solvency/safety

Sources: Indian Economy, Nitin Singhania, Chapter 7: Money and Banking, p.161, 168, 170

8. Statutory Liquidity Ratio (SLR): Meaning and Composition (intermediate)

The Statutory Liquidity Ratio (SLR) is a mandatory reserve requirement that ensures banks maintain a specific portion of their deposits in safe and highly liquid assets. While the Cash Reserve Ratio (CRR) is kept as cash with the RBI, the SLR is maintained by banks with themselves on a daily basis Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.63. This requirement is calculated as a percentage of a bank's Net Demand and Time Liabilities (NDTL)—essentially the total of the public's savings, current, and fixed deposits minus what banks owe to other banks. Under the Banking Regulation Act, 1949, the RBI has the authority to set this ratio, which currently has a legal ceiling of 40% Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.63.

The primary goal of SLR is twofold: first, it acts as a safety cushion for depositors, ensuring that banks have liquid assets to sell if there is a sudden rush of withdrawals. Second, it allows the RBI to influence the flow of credit in the economy. By increasing the SLR, the RBI forces banks to park more money in government securities, thereby leaving them with less money to lend to the private sector. Conversely, lowering the SLR releases more funds for commercial lending.

The composition of SLR is strictly defined to include only the most liquid assets. These are:

• Cash: Including any excess cash held with the RBI beyond the mandatory CRR requirement Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.63.
• Gold: Valued at current market prices.
• Government Securities (G-Secs): Specifically unencumbered securities (those not already pledged for other loans).

Interestingly, in modern banking regulation, these SLR-eligible assets are also considered High-Quality Liquid Assets (HQLAs). This helps banks meet the Liquidity Coverage Ratio (LCR), a global standard ensuring banks can survive a 30-day stress scenario Indian Economy, Nitin Singhania (2nd ed. 2021-22), Financial Market, p.236.

Feature	Cash Reserve Ratio (CRR)	Statutory Liquidity Ratio (SLR)
Where is it kept?	With the RBI	With the Bank itself
Forms allowed	Only Cash	Cash, Gold, and G-Secs
Primary Act	RBI Act, 1934	Banking Regulation Act, 1949
Returns/Interest	No interest earned	Banks earn interest on G-Secs

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.63; Indian Economy, Nitin Singhania (2nd ed. 2021-22), Financial Market, p.236

9. Solving the Original PYQ (exam-level)

Now that you have mastered the basics of Monetary Policy Tools, you can see how the UPSC tests your ability to distinguish between internal and external reserve requirements. This question focuses on the liquidity a bank must maintain relative to its total assets. While you learned that the Cash Reserve Ratio (CRR) involves keeping cash specifically with the RBI, the Statutory Liquid Ratio (SLR)—more commonly known as the Statutory Liquidity Ratio—requires banks to maintain a percentage of their deposits in liquid assets like cash, gold, or government securities within their own vaults. As highlighted in Indian Economy, Nitin Singhania, this ensures that banks always have a safety net of liquid assets to meet the demands of their depositors.

To arrive at the correct answer, (B) SLR, you must focus on the phrase "cash in hand" and "total assets." Even though the question uses slightly simplified terminology, it points toward the reserve that banks hold themselves rather than the cash they park with the Central Bank. In the UPSC exam, you must often choose the best available option. Since SLR is the only recognized statutory requirement listed that involves assets held by the commercial banks, it is the definitive choice for this ratio.

UPSC frequently uses fabricated acronyms like SBR, CBR, and CLR to trap students who may have only a vague memory of the terminology. These are distractor options designed to look technical but have no basis in the Macroeconomics (NCERT class XII) framework. Always remember: if the ratio concerns cash held with the RBI, look for CRR; if it concerns liquid assets (including cash) held by the bank itself to balance its assets, SLR is the tool you are looking for. By eliminating the non-existent terms, you can navigate this question with precision.