Banking is the backbone of any modern economy, and it shows up reliably in the CDS & OTA General Studies and Economics portions. In this Cavalier lesson you will master the role of the RBI, the different types of banks, how banks create credit, the main tools of monetary policy and the financial institutions that support growth, with solved sums and a previous-year style question to lock it in.
Why Banking Matters in the CDS Paper
Every modern economy runs on the flow of money, and that flow is managed by banks and financial institutions. The CDS General Studies paper and the OTA economics portion regularly carry one or two direct questions on the Reserve Bank of India, types of banks and monetary policy. These are easy, scoring marks once the vocabulary is clear.
A bank is a financial institution that accepts deposits from the public, lends that money to borrowers, and provides payment services. By moving idle savings into productive investment, banks act as the link between savers and investors. Without this link, the savings of millions of households would simply sit unused, and farmers, factories and traders would struggle to find the capital they need to grow.
For the exam, treat banking as a chain of three ideas that build on each other: first money and what it does, then the banks and the RBI that manage it, and finally the policy tools that control how much money circulates. Once you see them as one story, the individual facts become much easier to recall under pressure.
A bank performs two core jobs: it accepts deposits (a liability it owes back) and it advances loans (an asset it earns interest on). The gap between lending and deposit rates is the bank’s main income, called the spread.
Money and the Role of Financial Institutions
Before banking, people exchanged goods directly through barter, which needed a ‘double coincidence of wants’ — both sides had to want what the other offered. Money solved this problem by acting as a common medium of exchange.
Money performs four classic functions:
- Medium of exchange: accepted by all for buying and selling.
- Measure of value: a common unit (the rupee) to price everything.
- Store of value: purchasing power can be saved for later.
- Standard of deferred payment: loans and future dues are settled in money.
Financial institutions are organisations that deal in money and credit — banks, insurance companies, mutual funds and development banks. They channel household savings into loans for farmers, industry and government. In doing so they perform three vital tasks for the economy: they mobilise savings from many small savers, they allocate capital to the most productive uses, and they spread risk across many borrowers and lenders so that no single failure brings down the system.
The currency notes you hold are issued by the RBI and carry a promise signed by the Governor — except the one-rupee note and all coins, which are issued by the Ministry of Finance, Government of India.
The Reserve Bank of India: The Central Bank
The Reserve Bank of India (RBI) is India’s central bank. It was established in 1935 under the RBI Act, 1934, and was nationalised in 1949. It sits at the apex of the banking system and regulates the entire flow of money and credit.
Key functions of the RBI:
- Issue of currency: the sole authority to print currency notes (above one rupee).
- Banker to the Government: keeps government accounts, manages public debt and advises on financial policy.
- Banker’s bank: holds reserves of commercial banks and lends to them as the lender of last resort.
- Custodian of foreign exchange reserves.
- Controller of credit: uses monetary policy to manage inflation and growth.
The RBI does not deal directly with the general public for ordinary deposits and loans. It is a regulator and a ‘bank for banks’, not a commercial bank.
Types of Banks in India
India’s banking system has several layers. Knowing the categories is enough for most CDS questions.
- Central bank: the RBI, the apex regulator.
- Commercial banks: accept deposits and give loans for profit. These include public-sector banks (majority government-owned, like State Bank of India), private-sector banks and foreign banks.
- Regional Rural Banks (RRBs): set up to serve rural and agricultural credit needs.
- Cooperative banks: owned by members, important for rural and small-scale credit.
- Development banks: provide long-term finance to industry and agriculture, such as NABARD (agriculture) and SIDBI (small industries).
Remember the specialised institutions by their job: NABARD → agriculture and rural development, SIDBI → small industries, EXIM Bank → foreign trade finance.
Functions of Commercial Banks
Commercial banks perform two broad sets of functions.
Primary functions
- Accepting deposits: current accounts (no interest, freely withdrawable), savings accounts (small interest), and fixed/time deposits (higher interest, locked for a period).
- Advancing loans: cash credit, overdrafts, term loans and discounting of bills.
Secondary functions
- Agency services: collecting cheques, paying bills, transferring funds.
- General utility services: lockers, foreign exchange, demand drafts.
A current account normally earns no interest because it is meant for frequent business transactions; only savings and fixed deposits earn interest. Candidates often mix these up.
How Banks Create Credit
Banks do not lend out every rupee deposited. By law they must keep part of each deposit as a reserve. The rest is lent out, gets re-deposited in the banking system, and is partly lent again. Through this chain, the banking system creates credit (deposits) several times the original cash — this is the money-multiplier effect.
Two reserve requirements set by the RBI control this:
- Cash Reserve Ratio (CRR): the share of deposits a bank must keep as cash with the RBI.
- Statutory Liquidity Ratio (SLR): the share of deposits a bank must keep in safe liquid assets (cash, gold, government securities) with itself.
The total deposits the system can create from a fresh deposit is given by the money multiplier:
Total credit = Initial deposit × (1 ÷ reserve ratio)
A lower reserve ratio means more credit creation; a higher ratio means less.
Worked Example: Credit Creation
Let us see how a small cash injection multiplies into much larger total deposits when banks keep only a fraction in reserve.
A person deposits ₹10,000 in a bank. If the required reserve ratio (CRR plus SLR) is 20%, how much total credit can the banking system finally create?
So the original ₹10,000 of cash supports total deposits of ₹50,000 in the system. Of this, ₹10,000 is held as reserves and ₹40,000 is fresh credit (loans) created.
If the question gives CRR and SLR separately, add them to get the total reserve ratio before dividing 1 by it. For example, CRR 4% + SLR 16% = 20%.
Monetary Policy: The RBI's Toolkit
Monetary policy is the RBI’s management of the money supply and interest rates to control inflation and support growth. Its tools fall into two groups.
Quantitative tools (affect the total volume of credit)
- Bank Rate / Repo Rate: the rate at which the RBI lends to banks. A higher repo rate makes borrowing costly and reduces money supply.
- Reverse Repo Rate: the rate at which the RBI borrows from banks, absorbing surplus cash.
- CRR and SLR: raising them reduces the funds banks have to lend.
- Open Market Operations (OMO): buying or selling government securities to inject or absorb cash.
Qualitative tools (affect the direction of credit)
- Margin requirements, moral suasion and credit rationing guide credit towards priority sectors and away from speculation.
To fight inflation, the RBI follows a tight (dear money) policy: it raises the repo rate, CRR and SLR to squeeze the money supply. To fight a slowdown, it does the opposite (cheap money).
NBFCs and Other Financial Institutions
Not every financial institution is a bank. Non-Banking Financial Companies (NBFCs) lend and invest like banks but cannot accept demand deposits (chequable current/savings accounts) and are not part of the payment system. Examples include companies offering vehicle loans, gold loans and leasing.
Other key pillars of India’s financial system are:
- SEBI: regulator of the stock market and capital markets.
- IRDAI: regulator of the insurance sector.
- Insurance companies and mutual funds: pool savings and channel them into investment.
An NBFC is not the same as a bank. The biggest difference is that NBFCs cannot issue cheques drawn on themselves and cannot accept demand deposits, so they are regulated differently from banks.
Financial Inclusion and Modern Banking
Financial inclusion means giving every citizen, especially the poor and rural population, access to affordable banking, credit and insurance. It reduces dependence on village moneylenders, who often charge crushing rates of interest and trap borrowers in cycles of debt. When ordinary people gain a bank account, they can save safely, receive government benefits directly, and borrow at fair rates for farming, education or a small business.
Important measures and trends include:
- Pradhan Mantri Jan Dhan Yojana (PMJDY): a national mission to open bank accounts for all households.
- Priority Sector Lending: banks must lend a set share of credit to agriculture, small industry and weaker sections.
- Digital banking: UPI, mobile banking and net banking have widened access to payments, allowing even small shopkeepers and rural users to send and receive money instantly without visiting a branch.
- Business correspondents: trained local agents who bring basic banking services to villages that have no nearby branch.
Together these steps move the unbanked population into the formal economy, where their money can be safely stored, tracked and put to productive use.
Link financial inclusion to the broader goal of economic development: when savings enter the formal banking system, they fund productive investment instead of lying idle, raising national income.
Previous-Year Style Question
Banking questions in CDS usually test definitions and the direction of policy. Try this one before reading the answer.
Q. To control inflation in the economy, which of the following steps is the Reserve Bank of India most likely to take?
Answer: Raise the repo rate, CRR and SLR. To curb inflation the RBI follows a tight (dear money) policy — making borrowing costlier and reducing the funds banks have available to lend, which shrinks the money supply and cools demand. Lowering these rates would do the opposite and is used during a slowdown.
Inflation high → rates UP (tight money). Growth weak → rates DOWN (easy money). This single rule answers a large share of monetary-policy questions.
Quick Recap and Revision
Run through these points the night before the exam to fix the whole chapter in your memory.
- Bank: accepts deposits and lends; the gap between rates is the spread.
- RBI (est. 1935): issues currency, banker to government and to banks, controller of credit, lender of last resort.
- Types of banks: central, commercial (public/private/foreign), RRBs, cooperative, development banks (NABARD, SIDBI).
- Credit creation: total credit = deposit × (1 ÷ reserve ratio); lower CRR/SLR means more credit.
- Monetary policy: quantitative (repo, CRR, SLR, OMO) and qualitative tools; tight money fights inflation.
- NBFCs lend but cannot accept demand deposits; SEBI regulates markets, IRDAI insurance.
Frequently asked questions
When was the Reserve Bank of India established and nationalised?
The RBI was established in 1935 under the Reserve Bank of India Act, 1934, and was nationalised in 1949, after which it became fully owned by the Government of India.
What is the difference between CRR and SLR?
CRR (Cash Reserve Ratio) is the portion of deposits banks must keep as cash with the RBI, while SLR (Statutory Liquidity Ratio) is the portion they must keep with themselves in liquid assets like cash, gold and government securities. Both reduce the funds available for lending.
How do commercial banks create credit?
Banks keep only a fraction of deposits as reserves and lend the rest. The loaned money returns to the banking system as fresh deposits and is partly lent again, so total credit becomes a multiple of the original cash, equal to the deposit times one divided by the reserve ratio.
What is the difference between a bank and an NBFC?
A bank can accept demand deposits and is part of the payment system, so it can issue cheques drawn on itself. An NBFC lends and invests but cannot accept demand deposits or issue cheques, and it is regulated differently from banks.
What does the RBI do to control inflation?
To control inflation the RBI follows a tight or dear money policy, raising the repo rate, CRR and SLR. This makes borrowing costlier and reduces the money supply, lowering demand and price pressure in the economy.
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