Unit 04 — Central Bank and Money

1. The Central Bank and the Principles of Central Banking Core syllabus concept

1Understand the Concept

In every country's monetary system the central bank occupies the top position. It is the apex institution of the monetary system, and it regulates the functioning of the commercial banks p. 420. In India the central bank is the Reserve Bank of India (RBI); elsewhere it is the Bank of England, the Federal Reserve System in the United States, the Bank of France, and so on Slide 6.

Why a central bank is needed at all. Commercial banks keep only a fraction of their deposits in cash and lend the rest — this is the fractional reserve system. So even a well-run bank will be in trouble if, on one day, a large number of depositors rush to withdraw their money. Some institution must stand behind the banks and supply cash in such a crisis. The central bank fulfils that need — and today it also controls the cost and availability of credit and the growth of money supply for the whole economy p. 420.

The definitions to quote.

• Vera Smith: "The primary definition of central banking is a banking system in which a single bank has either complete control or a residuary monopoly of note issue." Slide 6
• A central bank is defined in terms of its functions — it is whatever bank performs the functions explained in concept 2 Slide 6.

2The principles of central banking

The principles on which a central bank is run differ from ordinary banking principles p. 420:

Principle	What it means
1. Public interest, not profit	An ordinary bank is run for profit. A central bank exists to promote financial and economic stability. DeKock: "The guiding principle of a central bank is that it should act only in the public interest and for welfare of the country and without regard to profit as primary consideration." Profit is at best a secondary consideration.
2. Not a competitor of other banks	It is not a profit-hunting institution and does not act as a rival of the commercial banks. It is their leader, guide and support.
3. It is the monetary authority	It functions so as to promote economic stability and development — regulating credit and money supply, and promoting price stability.
4. It serves the nation's economic policy	The RBI operates its instruments so that they serve the objectives of economic policy laid down by the Government.
5. A bank for banks and for the government	It does not normally deal with the general public as an ordinary bank does; its customers are the government and the banks. (General principle; it follows from the functions in concept 2.)

3The Reserve Bank of India — the facts to remember

Your lecture deck gives the RBI's history in one slide Slide 2:

• Established on 1 April 1935 as a shareholders' bank, with share capital of ₹5 crore divided into shares of ₹100 each, fully paid up.
• At first the entire share capital was owned by private shareholders; the then Government of India held shares of nominal value of only ₹2,22,000.
• Nationalised on 1 January 1949 under the Reserve Bank (Transfer to Public Ownership) of India Act, 1948, and became a State-owned institution.
• As the central bank of the country, it is the apex institution of the Indian monetary system.

Organisational structure Slide 5: the RBI is governed by a Central Board of Directors, headed by the Governor, assisted by Deputy Governors, and then Executive Directors and a hierarchy of general managers down to support staff. The functional chart Slide 4 shows departments under each Deputy Governor — monetary policy, banking supervision, currency management, foreign exchange, government accounts, rural planning and credit, and so on.

4Simple Explanation

5Exam-Ready Answer

6Possible Exam Questions

• What is a central bank? Explain the principles of central banking.
• How does a central bank differ from a commercial bank?
• Write a short note on the Reserve Bank of India.
• Draw the structure of the banking system in India.

7Common Mistakes

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2. Functions of the Central Bank (RBI) Core syllabus concept

1Understand the Concept

The textbook lists six main functions — note issue, banker to the state, bankers' bank, control of credit, lender of the last resort and management of the exchange rate — and adds the promotion of economic growth for developing countries pp. 420–424. Your lecture deck lists the same ground as eight RBI functions Slide 7. The table below merges both lists so you lose nothing whichever version you write.

Function	What the central bank does
1. Regulator of currency / note issue	It has the monopoly of issuing paper currency, and therefore controls the supply of currency. In India the whole note issue is by the RBI, except one-rupee notes, which are issued by the Ministry of Finance. Before 1956 India followed the proportional reserve system (40% of notes issued had to be backed by gold and foreign exchange). Since 1956–57 it follows the minimum reserve system: the RBI keeps a minimum reserve of ₹200 crore in gold and foreign securities (of which gold at least ₹115 crore), and can then issue notes according to the needs of the economy p. 421, p. 391.
2. Banker, fiscal agent and adviser to the government	It keeps all government balances (paying no interest on them), receives and makes payments on the government's behalf, manages the public debt and arranges new loans, gives short-term loans to the government (by discounting treasury bills), and advises the government on currency, exchange and finance p. 421.
3. Bankers' bank — custodian of cash reserves	Every bank is bound by law to keep a fixed portion of its deposits as reserves with the central bank (the cash reserve ratio). These reserves let the central bank control the credit created by banks; in return the banks can depend on it in an emergency, through loans against approved securities or rediscounting of bills p. 421.
4. Lender of the last resort	When a bank faces a sudden rush of withdrawals and no other bank will lend to it, the central bank supplies cash to it and allays the panic. It is the last source of credit — see step 2 below p. 422.
5. Clearing house for transfers and settlements	Because all banks keep reserves with it, inter-bank claims are settled simply by debits and credits in its books. If clearing goes heavily against a bank, its reserves fall below the limit and it must make up the shortfall p. 422.
6. Controller of credit	Its chief objective is price and economic stability, and the supply and cost of credit drive aggregate demand. So it restricts credit to fight inflation and expands it to fight depression — through the bank rate, open market operations, reserve ratios and selective controls (concept 4) p. 422.
7. Custodian of foreign exchange reserves; manager of the exchange rate	It holds the country's foreign exchange reserves and prevents excessive depreciation or appreciation of the rupee. If the rupee falls sharply, the RBI sells dollars from its reserves (Fig. 19.1: demand for dollars rises and the rupee falls from ₹62 to ₹64 per dollar; RBI supplies extra dollars and restores ₹62). It did this in 1998, 2003 and 2013–14. It can also cut the demand for dollars by raising the CRR and repo rate (1998), or buy dollars to stop excessive appreciation pp. 423–424.
8. Promoter of economic growth; developer and supervisor of the banking system	In developing countries it promotes agricultural and industrial development by making credit available for investment at lower rates, and builds financial institutions (IFCI, State Finance Corporations), ensures agricultural credit, term finance and export credit pp. 422–423. It also supervises commercial banks and regulates branch expansion Slide 7.

2Why the central bank is called the "lender of the last resort"

This is asked on its own — Re-Exam Q6 asked exactly this p. 422:

1. Commercial banks work on the fractional reserve system, so even a well-managed bank cannot meet a sudden and large demand for cash.
2. At such times — when panic prevails, public confidence is shaken and other banks refuse to lend — there is no other institution to turn to.
3. The central bank "boldly steps forward to supply cash and allay panic", by lending against approved securities or rediscounting bills. It is therefore the last source of credit — the lender after every other lender has said no.
4. By doing this it prevents bank failures from spreading, protects depositors and maintains public trust in the whole banking system.

3Simple Explanation

4Exam-Ready Answer

5Possible Exam Questions

• Explain the functions of a central bank with reference to the RBI.
• Why is the central bank called the lender of the last resort?
• How does the RBI act as banker to the government and as the bankers' bank?
• How does the RBI manage the exchange rate of the rupee? Illustrate with a diagram.
• How are the functions of a central bank different from those of a commercial bank?

6Common Mistakes

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3. Objectives of the Central Bank Core syllabus concept

1Understand the Concept

Functions are what the central bank does; objectives are what it is trying to achieve. The textbook states the chief objective in one line — to maintain price and economic stability, because both inflation and deflation are harmful and trade cycles cause great suffering p. 422. The lecture deck lists six objectives Slide 8:

Objective	Explanation
1. Stabilise the internal price level	Control inflation and deflation, so that the value of money stays stable. In India the RBI has set targets for money supply growth consistent with output growth, and the control of inflation by checking excessive credit has been its major concern p. 422.
2. Stabilise the rate of foreign exchange	Prevent large swings in the external value of the currency, which are harmful for trade and investment p. 423.
3. Protect the outflow of gold	Historically, under the gold standard, a central bank had to prevent the drain of its gold reserves; today this means protecting the country's foreign exchange reserves.
4. Control the business cycle	Expand credit in depression and restrict it in boom, to reduce cyclical fluctuations in output and employment.
5. Meet business needs	Provide an elastic supply of money and credit that expands and contracts with the genuine needs of trade, agriculture and industry (for example, the busy harvest season).
6. Growth with stability	In a developing country, promote economic growth — savings, investment and their allocation — while keeping prices stable (concept 5).

2Exam-Ready Answer

3Possible Exam Questions

• What are the objectives of a central bank?
• Illustrate the role of the central bank in maintaining price stability. (Final Q1d — solved on the Solved Papers page)
• Distinguish between the functions and the objectives of a central bank.

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4. Credit Control — Quantitative and Qualitative Methods Core syllabus concept

1Understand the Concept

Bank credit is an important part of the money supply, so its volume and direction shape the level of economic activity. Excessive credit generates inflationary pressure; deficient credit tends to cause depression or deflation; and a lack of cheap credit can hinder development. So the central bank expands credit in depression, contracts it in boom, and makes cheap credit available for development p. 424. Your deck left this topic for class discussion Slide 9, so the textbook is the source here.

There are two families of methods p. 424:

• Quantitative or general methods — change the total quantity and cost of credit: (i) bank rate (and repo rate), (ii) open market operations, (iii) the cash reserve ratio — plus the statutory liquidity ratio in India.
• Qualitative or selective methods — change the direction of credit, i.e. how much goes to particular uses.

2Quantitative methods, one by one

(a) Bank rate policy. The bank rate is the minimum rate at which the central bank lends to commercial banks; it is also called the discount rate, since central banks once lent by rediscounting bills of exchange p. 424.

• To fight inflation it is raised: banks find borrowing costlier and raise their own lending rates; businessmen borrow less; credit and money supply contract; aggregate demand and prices fall.
• To fight recession it is lowered: loans become cheaper, borrowing and investment rise, and aggregate demand recovers p. 425.
• With free capital flows, a higher bank rate also attracts funds from abroad and improves the balance of payments.
• Limitations pp. 425–426: other interest rates must follow the bank rate, which needs a well-organised money market (India's has a large indigenous-banker segment); banks with surplus reserves need not borrow from the central bank at all; and businessmen may not respond, since investment depends more on profit expectations — in a depression "you can bring the horse to water but you cannot make it drink." Bank rate is therefore more effective in checking a boom than in reviving a slump.

Repo and reverse repo. In India the repo rate — the rate at which the RBI lends overnight funds to banks against government securities under its liquidity adjustment facility — has replaced the bank rate as the main signalling rate. The reverse repo rate is the rate the RBI pays when banks park surplus funds with it; through reverse repo the RBI mops up liquidity. Repo is a short-term rate, the bank rate a longer-term one, and unlike open market operations repo deals are for a day or a few days at a rate fixed by the RBI Ch. 19A pp. 434–435.

(b) Open market operations (OMO) — the purchase and sale of government securities by the central bank p. 426.

• Selling securities: buyers pay by cheques on their banks, banks' cash reserves with the central bank fall, and their lending contracts.
• Buying securities: the central bank pays with cheques on itself, banks' reserves rise and credit expands. The maxim: "Take care of the legal tender money and credit will take care of itself."
• OMO can also make the bank rate effective by withdrawing banks' surplus funds.
• Limitations: currency may flow in or out of hoards and offset the change in reserves; banks need not keep a fixed cash-to-credit ratio; borrowers may not respond; and the velocity of bank deposits is not constant pp. 426–427.
• Why it works better in developed countries: it changes banks' capacity to lend automatically, but it needs a broad, active securities market — which India now has, so the RBI uses OMO extensively p. 427.

(c) Variable cash reserve ratio (CRR). Banks must keep a legal minimum percentage of their deposits as cash reserves. The textbook's example p. 427:

CRR	Reserves of ₹4,000 can support deposits of	Effect
20%	₹4,000 ÷ 0.20 = ₹20,000	starting position
raised to 25%	₹4,000 ÷ 0.25 = ₹16,000	credit must contract by ₹4,000
cut to 10%	₹4,000 ÷ 0.10 = ₹40,000	credit can expand to ₹40,000

A rise in CRR contracts credit only if banks have no excess reserves; a cut expands credit only if borrowers are willing to borrow.

(d) Statutory liquidity ratio (SLR). In addition to the CRR, Indian banks must keep a minimum proportion of their deposits in specified liquid assets, mainly government securities. Raising the SLR mops up liquidity and reduces lendable funds p. 572.

3Qualitative (selective) methods

Selective controls regulate the flow of credit to particular uses rather than its total pp. 427–429. They have a positive side — pushing more credit to priority sectors (agriculture, small and marginal farmers, artisans, small-scale industry) — and a negative side — restricting credit to undesirable or speculative uses. The techniques:

1. Changing the minimum margin for loans against stocks of specific goods — the most used technique in India. If the margin on a commodity is 60%, a trader can borrow 40% of its value; raise it to 70% and he can borrow only 30%. Unable to finance the extra 10%, he must sell stock — market supply rises and its price falls.
2. A ceiling on advances to individual borrowers against stocks of sensitive commodities.
3. Discriminatory (higher) interest rates on credit for particular purposes.
4. Prohibiting the discounting of bills involving the sale of sensitive commodities.
5. Moral suasion — policy statements, public announcements, appeals and advice to banks, which generally follow the central bank as their leader p. 429.

In India selective controls have been used since 1956 against speculative hoarding of foodgrains, oilseeds, vegetable oils, cotton, sugar, gur and khandsari. They succeed only if accompanied by general controls (or borrowers raise funds against other securities), and if businessmen cannot fall back on their own funds, the unregulated market or black money p. 429.

4The direction table — learn this

Instrument	To control inflation	To fight recession
Bank rate / repo rate	Raise	Lower
Open market operations	Sell securities	Buy securities
CRR and SLR	Raise	Lower
Margin requirements	Raise (on sensitive goods)	Lower
Moral suasion	Advise restraint	Encourage lending

Point	Quantitative (general)	Qualitative (selective)
Aim	Total volume and cost of credit	Direction / allocation of credit
Instruments	Bank rate, repo, OMO, CRR, SLR	Margins, ceilings, discriminatory rates, moral suasion
Coverage	Affects all sectors alike	Affects chosen sectors or commodities
Best for	General inflation or recession	Speculation and hoarding in particular goods; priority-sector lending

5Simple Explanation

6Exam-Ready Answer

7Possible Exam Questions

• Explain the quantitative and qualitative methods of credit control used by a central bank.
• What is bank rate policy? What are its limitations?
• Explain open market operations. Why are they more effective in developed countries?
• Distinguish between bank rate and repo rate; between CRR and SLR.
• What are selective credit controls? Explain their significance for India.
• Which methods of credit control — quantitative or qualitative — are better suited to India?

8Common Mistakes

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5. Role of the Central Bank in Economic Development Core syllabus concept

1Understand the Concept

Economic growth means expanding productive capacity, and it is speeded up by raising saving and investment. That requires four steps — and monetary policy can help each one p. 441:

1. an increase in the rate of saving;
2. mobilisation of those savings for investment;
3. an increase in the rate of investment; and
4. allocation of investment funds to productive and priority sectors.

Your deck left this topic for class discussion Slide 10; the textbook's appendix on Role of Monetary Policy in Economic Growth is the source.

2How the central bank promotes development

Channel	What the central bank does
1. Raising savings	Keeps the real interest rate positive (nominal rate above inflation) so that saving is rewarded; the textbook suggests it should not fall below about 5%. Expands bank branches into rural and under-banked areas — commercial bank offices rose from 8,262 in July 1969 to 62,350 by 1995, and bank deposits' share in domestic saving rose from 8.7% to 22.5% between 1969-70 and 1982-83. Lewis: if saving institutions are "under the individual's nose", people save more pp. 441–442.
2. Price stability	Only under reasonable price stability will people save in financial form rather than in gold, real estate and inventories (Dr Manmohan Singh as RBI Governor) p. 442.
3. Cost and availability of credit for investment	Easy money when investment is slack: prime lending rates fell from 15–16% to 9–10% between 1996 and 2003; after the 2008 crisis the RBI cut the repo rate from 9% (July 2008) to 4.75% (March 2009). Credit availability matters as much as its cost p. 443.
4. Financing private and public investment	Ensures the private sector's working-capital and investment needs are met, with a specified share of loans to priority sectors (agriculture, small and medium enterprises) at concessional rates. Through the SLR, banks invest in government securities and so finance public investment in infrastructure — which "crowds in" private investment pp. 443–444.
5. Allocation of funds	Selective credit controls and credit rationing steer funds away from speculation and luxury uses into productive channels; special institutions such as the Industrial Development Bank channel savings into industry pp. 444–445.
6. Building financial institutions	The RBI helped set up institutions such as the Industrial Finance Corporation of India and State Finance Corporations, and apex bodies for agricultural credit, term finance to industry and export credit p. 423, p. 445.

Limitation. In a developing country the huge public-sector investment is not really under the monetary authority's control, and to support government borrowing its rate policy tends to become inflexible p. 445.

3"Sustainable development" — how Re-Exam Q6 framed it

The 2026 Re-Exam asked for the central bank's role in sustainable development. The official answer key adds these points to the growth channels above:

• macroeconomic stability — controlling inflation and keeping interest rates stable — which encourages long-term investment and planning;
• supervising financial institutions and guarding against financial crises;
• financial inclusion and the promotion of digital payment systems;
• directing credit to priority sectors such as green energy and infrastructure;
• advising the government on economic policy.

4Exam-Ready Answer

5Possible Exam Questions

• Discuss the role of the central bank in the economic development of a developing country like India.
• Highlight the role of the central bank in sustainable development. Why is it known as the lender of last resort? (Re-Exam Q6 — solved)
• How can monetary policy raise the rate of saving and investment?

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6. Money — Nature, Definitions and Functions Core syllabus concept

1Understand the Concept — why money was invented

Before money, exchange took the form of barter — goods for goods. The barter system had serious difficulties pp. 389–390:

1. Double coincidence of wants. You must find someone who has what you want and wants what you have — next to impossible in a modern economy with millions of exchanges.
2. No common unit of account. Every good's value must be expressed in every other good (two cows for a horse, one cow for two quintals of wheat…), so the number of exchange ratios becomes enormous.
3. Indivisibility of goods. A cow cannot be cut up to buy 5 kg of wheat without losing its value.
4. Lack of information. Traders need costly information to value each good against every other.
5. Large, costly goods not feasible. A car-maker would have to find a buyer holding a car's worth of food, clothing and everything else he needs.

Money was invented to provide a generally accepted medium of exchange and a common unit of account. It evolved from commodity money (shells, cattle) → metallic money (gold and silver coins) → paper money (first representative and convertible into gold; today inconvertible, fiat money issued on the government's order and accepted because it is legal tender) → bank deposits (credit money, used through cheques) pp. 390–392. Note: a credit card is not money — it is a loan from the card company that you finally repay with currency or bank deposits p. 392.

2Definitions of money

• Crowther (An Outline of Money): "Money can be anything that is generally acceptable as a means of exchange and that at the same time acts as a measure and a store of value."
• D. H. Robertson: "Money is anything which is widely accepted in payment for goods or in discharge of other kinds of business obligations."
• Walker: "Money is what money does." Slide 2

Two things follow p. 393: money is defined by its functions, and its essential quality is general acceptability — a social phenomenon, conferred by law or convention. When people lose confidence in a money (as with the German mark in the early 1920s), it ceases to be money.

3Functions of money

The classic couplet: "Money is a matter of functions four — a medium, a measure, a standard, a store." p. 393. Your deck lists eleven Slide 3, which group naturally into three tiers:

Group	Function	Explanation
Primary	Medium of exchange	The most important function. Money separates buying from selling, removing the need for double coincidence of wants, and makes specialisation possible.
	Measure of value / unit of account	All values — prices, wages, rent, interest — are expressed in one unit (the rupee), so they can be compared.
Secondary	Standard of deferred payments	Future payments (loans) are stated in money. This works only if money's value is stable — with severe inflation creditors lose; with deflation debtors lose p. 394.
	Store of value	Money is the most liquid asset, so wealth can be held in it and used at any time (the "asset function"). High inflation weakens this function and drives saving into gold and real estate p. 394.
	Transfer of value	Purchasing power can be moved from place to place and person to person.
Contingent	Equalisation of marginal utilities / productivities	Consumers and firms spend so that the last rupee yields equal benefit in every use.
	Measurement and distribution of national income	National income is measured in money and distributed as wages, rent, interest and profit.
	Basis of credit	Bank deposits and credit are built on a base of money.
	Productivity of capital	Money capital can move to its most productive use.
	Liquidity of capital	Wealth held as money can be converted into any other asset instantly.
	Utilisation of resources	Money facilitates the full use of the economy's resources.

Forms of money worth one line each: money of account (the unit in which accounts are kept); legal tender, limited or unlimited (rupee coins and notes are unlimited legal tender); standard money; and fiduciary money — demand deposits, which work on trust rather than legal compulsion p. 395, p. 454.

4Simple Explanation

5Exam-Ready Answer

6Possible Exam Questions

• Define money. Explain its functions.
• "Money is what money does." Explain.
• What were the difficulties of the barter system? How did money overcome them?
• Define money and money supply. (Re-Exam Q1d — solved)

7Common Mistakes

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7. Supply of Money — Measures, Money Multiplier and Credit Creation Core syllabus concept

1Understand the Concept

Money supply refers to the stock of money held by the people in spendable form — the total stock of domestic means of payment owned by the public (individuals and business firms). It includes money held by the public and in circulation, but not money held by the RBI, the commercial banks or the treasury, because these are money-creating agencies Slide 4. Two points to note pp. 453–454:

• Money supply is a stock (at a point of time), unlike national income, which is a flow (per year).
• Its basic components are currency with the public and demand deposits with banks.

2The RBI's four measures of money supply (since April 1977)

• M1 and M2 are narrow money; M3 and M4 are broad money Slide 5. Liquidity falls from M1 to M4.
• Post-office savings deposits are not in M1 because they lacked cheque facilities; time deposits are not in M1 because they cannot be withdrawn by cheque — though they can be borrowed against p. 456.
• M3 is the measure the RBI prefers for monetary planning, as recommended by the Sukhamoy Chakravarty committee p. 456.

3What determines money supply — high-powered money and the money multiplier

Money supply is not set by the RBI alone: the public and the banks also play a part p. 453. The textbook's "money-multiplier theory" pp. 457–460:

Currency held by the public passes into money supply one-to-one, but each rupee of bank reserves supports several rupees of deposits. So money supply increases when p. 460:

1. high-powered money H increases;
2. the public's currency–deposit ratio k falls (people bank more of their money); and
3. the banks' reserve ratio r falls (e.g. the RBI cuts the CRR).

4How banks create money — credit creation (the PSO2 numerical)

A bank is "a factory for the manufacture of credit". Because depositors never all withdraw at once, a bank keeps only a fraction of deposits as cash and lends the rest; the loan is credited to the borrower's account as a new deposit, which, when spent, is deposited in another bank, which lends again — and so on pp. 412–413. The textbook's example with a cash reserve ratio of 20% and a fresh cash deposit of ₹1,00,000 pp. 416–417:

Bank	New deposit	Required reserve (20%)	Loan given (excess)
A	₹1,00,000	₹20,000	₹80,000
B	₹80,000	₹16,000	₹64,000
C	₹64,000	₹12,800	₹51,200
D	₹51,200	₹10,240	₹40,960
… all banks	₹5,00,000	₹1,00,000	₹4,00,000

Limits to credit creation (Benham and Crowther) pp. 417–419: (i) the amount of cash in the economy, which the central bank controls; (ii) the public's habit of holding cash — every cash withdrawal is a leakage (strong in India, weak in the USA and UK); (iii) the cash reserve ratio — the most important limit; (iv) the amount the public chooses to deposit, which depends on deposit rates; and (v) banks lend against assets — as Crowther put it, "the bank does not create money out of thin air, it transmutes other forms of wealth into money." The cash leakage is exactly why the full money multiplier (1 + k)/(r + k) is smaller than the simple 1/r.

Worked numericals on both multipliers are on the Numerical Lab.

5Simple Explanation

6Exam-Ready Answer

7Possible Exam Questions

• What is money supply? Explain the measures of money supply used by the RBI.
• Explain the determinants of money supply. What is the money multiplier?
• How do commercial banks create credit? What are the limitations on credit creation?
• Calculate the total deposits created from a primary deposit of ₹50,000 if the CRR is 10%. What happens if the CRR is raised to 20%?
• Distinguish between narrow money and broad money.

8Common Mistakes

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8. Demand for Money — Motives for Liquidity Preference Core syllabus concept

1Understand the Concept

The demand for money is the quantity of money people are willing and able to hold at alternative interest rates, other things being equal. Deciding how to hold one's idle funds is a portfolio decision Slide 6. Holding money earns little or no interest — so why hold it? Note also that people want real balances (purchasing power), not a number of notes; caring only about the nominal amount is money illusion p. 470.

2Three approaches

Approach	Equation	Idea
Classical — Fisher's transactions approach (Hume, Mill, Fisher)	MV = PT  ⟹  Md = PT / V	Money is only a medium of exchange. Demand depends on the number of transactions T, the price level P and the velocity V (assumed constant). A mechanical, "technical" requirement, not behaviour pp. 471–472.
Neo-classical — Cambridge cash-balance approach (Marshall, Pigou)	Md = kPY	Money is also a store of value; people hold a proportion k of their nominal income as cash balances. Behavioural, but interest and wealth stay in the background pp. 472–473. Your slide writes it as Md = KY Slide 7.
Keynesian — liquidity preference	Md = L1(Y) + L2(r)	Three motives — transactions, precautionary, speculative — the last making money demand depend on the rate of interest pp. 474–477.

3Keynes's three motives for liquidity preference

Keynes called the demand for money liquidity preference — the desire of the public to hold cash p. 474. It arises from three motives Slide 9:

1. Transactions motive — money held to make everyday purchases, "to bridge the interval between the receipt of income and its expenditure". Income comes weekly or monthly; spending is daily. It depends on the size of income, the interval of payment and the payment habits of society; for firms (the business motive), on turnover. It arises from the medium-of-exchange function.
2. Precautionary motive — money held for unforeseen contingencies such as unemployment, sickness and accidents. It depends on the individual's psychology and circumstances, and also mainly on income.
3. Speculative motive — money held to take advantage of future changes in the rate of interest, that is, in bond prices. Bond prices and interest rates move inversely. If the interest rate is expected to rise (bond prices to fall), people hold cash to avoid capital losses and buy bonds later; if it is expected to fall, they buy bonds now. At a high current rate little money is held idle (the cost of holding it is high); at a low rate much more is held. So speculative demand is a decreasing function of the interest rate — Keynes's revolutionary idea.

Criticism and modern form p. 477: Tobin and Baumol showed that even transactions demand responds to the interest rate (the opportunity cost of holding cash); speculative demand also depends on wealth; and since one rupee can serve several motives at once, demand cannot really be split into separate compartments. Hence the modern form M_d = L(Y, r). Keynes's idea that people hold either all money or all bonds is unrealistic — leading to the portfolio approach.

Four factors that influence the motives for holding money Slide 10: the price level, income, the interest rate and credit availability.

Money-market equilibrium. Since the stock of money at any time is fixed by the central bank, money supply is a vertical line; the rate of interest is set where it cuts the total demand for money — in your slide's example, at 7.2% Slides 13–14. This is Keynes's liquidity preference theory of interest: interest is the reward for parting with liquidity.

4Simple Explanation

5Exam-Ready Answer

6Possible Exam Questions

• Explain Keynes's motives for liquidity preference.
• What is meant by the demand for money? Compare the classical, Cambridge and Keynesian approaches.
• Why is the speculative demand for money inversely related to the rate of interest?
• How is the rate of interest determined in Keynes's liquidity preference theory? Draw the diagram.

7Common Mistakes

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9. The Liquidity Trap Core syllabus concept

1Understand the Concept

The liquidity preference (speculative demand) curve slopes down — but at a very low rate of interest it becomes flat, i.e. perfectly elastic. This flat portion shows absolute liquidity preference: at that rate people will hold as idle balances any amount of money they come to have p. 476. Your slide quotes Keynes's own framing: a "remote possibility of people holding a very large or unlimited amount of idle cash balance when market rate of interest is critically low" Slide 15.

Why people behave this way. When the interest rate is at a critical minimum, everyone expects it to rise — that is, bond prices to fall. Buying bonds now means a capital loss later, and the interest income given up by holding cash is negligible. So all extra money is simply held.

2Why monetary policy fails in the trap — Keynes's two weak links

Expansionary monetary policy is meant to work like a chain: more money → lower interest → more investment → higher aggregate demand → (multiplier) → higher income p. 512. Keynes saw two weak links in that chain in a depression pp. 513–514:

1. Money → interest breaks (the liquidity trap). In a depression the interest rate is already very low. Any increase in money supply is held idle, so the interest rate does not fall — Ms₂ → Ms₃ in the figure.
2. Interest → investment is weak. Even if interest fell, investment demand is interest-inelastic in a slump, because it depends on the marginal efficiency of capital (expected profit), which is very low. "You can bring the horse to water but you cannot make it drink."

So with no rise in investment, aggregate demand and national income do not rise. Conclusion: in a liquidity trap monetary policy is ineffective, and fiscal policy — government spending — must be used. In the IS-LM model this is the horizontal (Keynesian) range of the LM curve, where an increase in money supply cannot lower the interest rate and fiscal expansion raises income without crowding out — see Unit 2 · IS-LM.

3Real-world examples

• The Great Depression of the 1930s — the situation Keynes was analysing: interest rates were already very low and cheap money failed to revive investment.
• Japan in the 1990s ("the lost decade") — after its asset bubble burst, interest rates near zero failed to revive spending, and prices fell.
• After the 2008 global financial crisis — the US and Europe cut policy rates to near zero; because conventional rate cuts could go no further, central banks turned to unconventional measures, and governments to fiscal stimulus.

4Simple Explanation

5Exam-Ready Answer

6Possible Exam Questions

• Explain and illustrate the liquidity trap and its impact on the economy with a suitable example. (Final Q6 — solved)
• Why does monetary policy become ineffective in a liquidity trap?
• Show the liquidity trap in the IS-LM framework. Which policy is effective there and why?

7Common Mistakes