What money is and what it does

Detail

1. Definition of money

• Money is the commonly accepted medium of exchange. It makes buying and selling in a market easy (Class 12, Money and Banking).

• Medium of exchange means something people take in return for goods only because they can pass it on to buy other goods.

• Money is a social tool. It is needed only when there is exchange.

• A single person, or one family living alone on an island, produces and uses its own goods. So it has no use for money.

• Money becomes important once two or more people trade through a market.

• Class 7 definition: money is "the common tool that everybody accepts and uses" to make or receive payments.

• Money in a modern economy = cash + bank deposits.
• Cash means currency notes and coins.

• Bank deposits mean demand deposits in banks. They can be spent by cheque, debit card or UPI, so they work like cash.

• RBI's framing: money has changed form over time, from commodity money → metallic currency → paper currency → digital currency [2][3].

• Commodity money means goods like grain or cattle used as money.

• Metallic currency means coins such as the ancient Indian karshapana.

• Digital rupee (e₹): RBI defines Central Bank Digital Currency (CBDC) as "the legal tender issued by a central bank in a digital form" [2][3].

• Legal tender means money that people must, by law, accept when a debt is being paid.
• CBDC is exchangeable at par with paper currency, so ₹1 in e₹ = ₹1 in notes [2].
• It is meant to be accepted as a medium of payment, legal tender and a safe store of value [2].
• It is meant to complement, not replace, existing forms of money and payment systems [2].
• RBI's Concept Note on CBDC was issued on 7 October 2022 [3].

2. Why money was needed: the problem with barter

• Barter means directly exchanging one good for another, with no money involved.
• Double coincidence of wants means that each of the two people must want exactly what the other person has to offer.

• Example (Class 10): a shoemaker wants wheat. He must find a wheat farmer who also wants shoes. That is hard.

• Money removes this problem. It acts as an in-between good.

• The shoemaker sells shoes for money. Then he uses that money to buy wheat from any farmer.
• One hard trade is split into two easy trades: a sale and a purchase.

3. The four functions of money

• The functions of money are the jobs money does in an economy. NCERT lists two primary and two secondary functions.
• High inflation can weaken all four.
• Inflation means a continuing rise in the general price level.

Type	Function	Meaning in simple words	NCERT illustration
Primary	Medium of exchange	A go-between good that everyone accepts, so barter is no longer needed	Sell shoes for money, then buy wheat (Class 10)
Primary	Unit of account (common denomination)	The value of every good is stated in money units, so relative prices can be worked out	Pen ₹10 ÷ pencil ₹2 → 1 pen = 5 pencils (Class 12)
Secondary	Store of value	Keeps wealth safe for future use, at low cost	Rice rots and needs storage space; money does not (Class 12)
Secondary	Standard of deferred payment	Money is accepted for payments made later	Pay ₹50 now and ₹50 later for a ₹100 book (Class 7)

• Medium of exchange: RBI describes it as money that "may be used for any transactions wherein goods or services are purchased or sold" [2].
• Unit of account: RBI describes it as money used "to value goods or services and express it in monetary terms" [2].
• Relative price means the price of one good measured in units of another good.
• Formula: relative price of good A in terms of B = Price of A ÷ Price of B.
• Worked example: pen ₹10, pencil ₹2 → 10 ÷ 2 = 1 pen = 5 pencils.

• Without a common unit, a market with 100 goods would need a separate exchange rate for every pair of goods: 100 × 99 ÷ 2 = 4,950 rates. With money you need only 100 prices. (This is a derived illustration.)

• Store of value: see section 5 below.

• Standard of deferred payment: deferred means "postponed" or "paid later".
• Loans, EMIs, salaries and rent are all fixed in money today and paid later.

• This works only if people trust that a rupee tomorrow will be worth about the same as a rupee today.

• Classification trap: RBI's CBDC Concept Note speaks of three functions of money: medium of exchange, unit of account and store of value [2].

• NCERT's four-way split (2 primary + 2 secondary) is the standard textbook version for UPSC.
• The "three functions" framing is common in RBI and international writing.

4. Purchasing power of money

• The purchasing power of money is the amount of goods that one unit of money can buy.

• From the pen–pencil example: ₹1 buys 1 ÷ 2 = 0.5 pencil, or 1 ÷ 10 = 0.1 pen.

• Formula: Value of money = 1 / Price.

• For the whole economy, P is the general price level, measured by a price index such as the CPI.

• CPI (Consumer Price Index) is an index that tracks the prices of a fixed basket of goods and services that households buy.

• Inverse relation: when prices rise, each rupee buys less.

• Class 12 calls this a "deterioration in the purchasing power of money".

• Worked example:

• The price index rises from 100 to 125, so prices are up 25%.
• The value of money falls from 1/100 to 1/125.
• Fall = (1/100 − 1/125) ÷ (1/100) = 1 − 100/125 = 20%.

• Trap: a 25% rise in prices causes a 20% fall in purchasing power, not a 25% fall.

• Money's worth is the value a person places on an object, based on the benefit they get from it.

• Prices stated in money let us compare this worth across different goods on one common scale.

5. Store of value: why money is better than other assets

• Why money is a good store of value:
• It does not spoil, unlike rice or wheat.
• It costs little to store, because it needs no godown and has no upkeep.

• It "is acceptable to anyone at any point of time".

• Condition: money stores value well only if its value is fairly stable, which means prices must be fairly stable.

• Other stores of value: gold, land, houses and bonds also hold wealth.
• The limit of these assets is liquidity.
• Liquidity means how quickly and cheaply an asset can be turned into goods, or into money, without losing value.
• Gold, land, houses and bonds are harder to convert into other goods and are not accepted by everyone.
• So they are less liquid than money. Cash is the most liquid asset.

6. How inflation damages the functions of money

• Stage 1: moderate inflation hits the secondary functions first.
• Store of value weakens. ₹100 saved when prices then rise 6% buys only 100 ÷ 1.06 ≈ ₹94.3 worth of goods in today's terms.
• Deferred payment weakens. Lenders and savers get back rupees that buy less.

• Worked example: a bank lends ₹1,000 at 5% interest and inflation is 8%.

  • Real interest rate means the interest rate minus inflation, which is roughly what the lender truly earns.
  • Here the real interest rate ≈ 5% − 8% = −3%. The lender loses and the borrower gains.

• Stage 2: hyperinflation breaks even the primary functions.

• Hyperinflation means extremely fast price rise. Prices can double within weeks or days.
• Medium of exchange fails: sellers refuse the local currency.
• Unit of account fails: people start stating prices in a foreign currency, such as the US dollar.

• Examples beyond NCERT: Weimar Germany (1923), Zimbabwe (2008), Venezuela (late 2010s).

• Winners and losers: fixed-income earners, savers and lenders lose. Borrowers with fixed-rate loans gain.

7. Link to policy: price stability and inflation targeting

• Logic: stable prices are the precondition for money to do its job. This is why India has a legal inflation target.
• Primary objective of monetary policy (RBI): "to maintain price stability while keeping in mind the objective of growth" [4].

• Monetary policy means RBI's management of interest rates and money supply.

• Legal basis: the RBI Act, 1934 was amended in 2016 to create a statutory framework for flexible inflation targeting [4].

• Flexible inflation targeting means RBI aims at a numerical inflation target but is also allowed to care about growth in the short run.

• Section 45ZA:

• The Central Government, in consultation with RBI, sets the inflation target in terms of CPI, once every five years [5].

• The target:

• 4% CPI inflation, with an upper tolerance level of 6% and a lower tolerance level of 2% [4][6].
• It was first notified on 5 August 2016 [4].
• It was retained on 31 March 2021 for 1 April 2021 – 31 March 2026 [4].

• It was retained again on 25 March 2026 for 1 April 2026 – 31 March 2031 [4].

• Failure of the target:

• RBI is treated as having failed if average CPI inflation is above 6% for three consecutive quarters, or below 2% for three consecutive quarters [4].

• Who decides:

• A six-member Monetary Policy Committee (MPC) sets the policy repo rate [4].
• Repo rate means the interest rate at which RBI lends money to banks for a short period.

• Members: the RBI Governor (Chair), one Deputy Governor, one RBI officer, and three external members appointed for four years [4].

• Why a band and not a single point: the band lets the MPC handle short-run trade-offs between inflation and growth. It also covers data limits, forecasting errors and supply shocks such as a bad farm harvest [5].

8. Keynes' line

• "The importance of money flows from it being a link between the present and the future." — J.M. Keynes. This is the epigraph of Class 7.
• It sums up the store-of-value role, which carries wealth to the future.
• It also sums up the deferred-payment role, which settles future debts.
• Both roles depend on trust that money will keep its value. That is the link to price stability.

Prelims Hooks

• Money is defined as the commonly accepted medium of exchange. In a modern economy, money = cash + bank deposits.
• Primary functions (NCERT): medium of exchange and unit of account. Secondary functions: store of value and standard of deferred payment.
• Trap: RBI's CBDC Concept Note (Oct 2022) counts three functions of money (medium of exchange, unit of account, store of value) and treats store of value on the same level as the other two [2].
• Money as a medium of exchange removes the need for a double coincidence of wants, which is the basic problem of barter.
• Value of money = 1 / Price level.

• A 25% rise in prices means a 20% fall in purchasing power, not 25%.

• Money is the most liquid asset. Gold, land, houses and bonds store value but are less liquid.

• Under inflation, store of value and deferred payment are damaged first. In hyperinflation, even the medium of exchange and unit of account fail.
• Inflation target: 4% CPI ± 2%. The Central Government sets it in consultation with RBI (not RBI alone), under Section 45ZA of the RBI Act, 1934, once every 5 years [4][5].
• Failure of the target = CPI inflation outside the 2–6% band for 3 consecutive quarters [4].
• CBDC (e₹) = legal tender issued by the central bank in digital form, exchangeable at par with notes [2][3].
• "Link between the present and the future" is Keynes' description of money and the epigraph of Class 7.

Mains Points

• Price stability is a public good for money itself.
• Inflation quietly transfers wealth from savers, pensioners and lenders to borrowers.
• In extreme cases it destroys money's role as a medium of exchange, as in Zimbabwe (2008) and Venezuela (late 2010s).

• This is why the 2016 RBI Act amendment made price stability a legal target of 4% ± 2% CPI. The target was renewed in 2021 and again in 2026 for 2026–31 [4].

• The same functions, in a new form.

• From the karshapana to paper notes to UPI and the e₹, money's four functions stay the same. Only the form changes.
• The e₹ is designed to complement, not replace cash. It supports financial inclusion and efficient payments [2].

• Open questions: privacy, the risk that people move deposits out of banks into e₹, and whether money stays legal tender only through state backing.

• Flexibility versus credibility (the band debate).

• A 2–6% band lets the MPC take account of growth and supply shocks, such as food prices [5].

• A wide band or frequent breaches can weaken trust that money will hold its value. That trust is what makes the store-of-value and deferred-payment functions work.

• Liquidity and the savings choice.

• When inflation is high, households move savings from bank deposits into gold and land. These are less liquid and less productive.
• This cuts the savings that banks can lend for investment. Stable prices help channel savings into the formal financial system.