Money

Topic: Money: From Barter to Digital Currency · NCERT: Class 7, Ch 11 "From Barter to Money"; Class 10, Ch 3 "Money and Credit"; Class 12, Ch 3 "Money and Banking"

Meaning

Money is the commonly accepted medium of exchange. A medium of exchange is something people take for their goods only because they can pass it on to buy other goods. In a modern economy, money means cash (currency notes and coins) plus bank deposits that can be spent at any time.

Money makes buying and selling easy, because it ends the need for barter. It works well only while people trust that it will keep its value. That is why price stability sits at the centre of India's monetary policy.

Formula: Value of money = 1 / P, where P is the general price level (measured by a price index such as the CPI).

Explanation

Why money is needed: the problem with barter

• Barter means swapping one good directly for another, with no money involved.
• The core problem is the double coincidence of wants. Each person must want exactly what the other person has.

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

• Money solves this by acting as an in-between good.

• The shoemaker sells shoes for money.
• The shoemaker then uses that money to buy wheat from any farmer.

• One hard trade becomes two easy trades: a sale and a purchase.

• Money is a social tool. A person or family living alone on an island makes and uses its own goods, so it has no use for money. Money matters only when 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.

The four functions of money (NCERT)

Type	Function	Meaning in simple words	NCERT example
Primary	Medium of exchange	A go-between 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	Pen ₹10, pencil ₹2 → 1 pen = 5 pencils (Class 12)
Secondary	Store of value	Keeps wealth safe for later, 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 ("deferred" = postponed)	Pay ₹50 now and ₹50 later for a ₹100 book (Class 7)

• Unit of account and relative prices:
• Relative price means the price of one good measured in units of another good.
• Relative price of A in terms of B = Price of A ÷ Price of B.
• Worked example: pen ₹10 ÷ pencil ₹2 = 1 pen = 5 pencils.

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

• Why money is a good store of value:

• It does not spoil, unlike rice or wheat.
• It costs little to store. It needs no godown and no upkeep.
• It "is acceptable to anyone at any point of time".

• Condition: this holds only if prices stay fairly stable.

• Money and liquidity:

• Liquidity means how quickly and cheaply an asset can be turned into goods or money without losing value.
• Gold, land, houses and bonds also store value. But they are harder to convert and not everyone accepts them, so they are less liquid.

• Cash is the most liquid asset.

• Deferred payment in daily life: loans, EMIs, salaries and rent are all fixed in money today and paid later. This works only if a rupee tomorrow is worth about the same as a rupee today.

• Keynes' line (the Class 7 epigraph): "The importance of money flows from it being a link between the present and the future."
• It covers the store-of-value role, which carries wealth into the future.
• It covers the deferred-payment role, which settles future debts.
• Both roles depend on trust that money keeps its value.

Purchasing power: what makes the value of money rise or fall

• Purchasing power of money means the amount of goods that one unit of money can buy.

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

• Inverse relation: when prices rise, each rupee buys less. Class 12 calls this a "deterioration in the purchasing power of money".

• Inflation means a continuing rise in the general price level.

• Worked example: price index goes from 100 to 125

• Prices are up 25%.
• The value of money falls from 1/100 to 1/125.
• Fall = 1 − 100/125 = 20%.

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

• Stage 1: moderate inflation hits the secondary functions first.

• Store of value weakens. If you save ₹100 and prices rise 6%, it buys only 100 ÷ 1.06 ≈ ₹94.3 worth of today's goods.
• Deferred payment weakens. Lenders get back rupees that buy less.

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

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

• Stage 2: hyperinflation breaks even the primary functions.

• Hyperinflation means an extremely fast price rise, where prices can double within weeks or days.
• Medium of exchange fails, because sellers refuse the local currency.
• Unit of account fails, because people start quoting 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.

Forms of money: from commodity to digital

• RBI describes how money has changed form over time: commodity money → metallic currency → paper currency → digital currency [2][3].
• Commodity money: goods such as grain or cattle used as money.
• Metallic currency: coins, such as the ancient Indian karshapana.
• Paper currency: today's notes.

• Digital currency: such as the digital rupee (e₹).

• Bank deposits work like cash. Demand deposits can be spent by cheque, debit card or UPI.

• The form changes, but the functions stay the same.

In India

• Early money: the karshapana was an ancient Indian metallic coin.
• 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 paid.
• The e₹ 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 money and payment systems [2].

• RBI issued its Concept Note on CBDC on 7 October 2022 [3].

• Protecting the value of money through the law:

• Monetary policy means RBI's management of interest rates and money supply.
• RBI's primary objective is "to maintain price stability while keeping in mind the objective of growth" [4].
• The RBI Act, 1934 was amended in 2016 to create a legal framework for flexible inflation targeting [4]. This means RBI aims at a number for inflation but may also 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].

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

• The target: 4% CPI inflation, with an upper tolerance level of 6% and a lower tolerance level of 2% [4][6].

• First notified on 5 August 2016 [4].
• Retained on 31 March 2021 for 1 April 2021 – 31 March 2026 [4].

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

• Failure of the target: average CPI inflation above 6% or below 2% for three consecutive quarters [4].

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

• Members: 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 number: 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 harvest [5].

Don't confuse with

• Barter: barter is a direct swap of goods and needs a double coincidence of wants. Money is an in-between good that removes that need.
• Other stores of value (gold, land, houses, bonds): they also hold wealth, but they are less liquid and not accepted by everyone. Money, and cash above all, is the most liquid asset.
• Rise in the price level vs fall in the value of money: they move in opposite directions, but not by the same percentage. Prices up 25% means the value of money is down 20%.
• NCERT's four functions vs RBI's three functions: NCERT splits them into 2 primary and 2 secondary. RBI's CBDC Concept Note lists only three (medium of exchange, unit of account, store of value) and puts store of value on the same level as the other two [2].

Prelims Hooks

• Money is 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 only three functions [2].
• Value of money = 1 / Price level. A 25% rise in prices means a 20% fall in purchasing power, not 25%.
• Moderate inflation damages store of value and deferred payment first. In hyperinflation, even medium of exchange and unit of account fail.
• The inflation target of 4% CPI ± 2% is set by the Central Government in consultation with RBI (not RBI alone), under Section 45ZA of the RBI Act, 1934, once every 5 years [4][5]. Failure = 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].

Mains Points

• Price stability protects money itself.
• Inflation quietly moves wealth from savers, pensioners and lenders to borrowers.
• In extreme cases it destroys money as a medium of exchange, as in Zimbabwe (2008) and Venezuela (late 2010s).
• This is why the 2016 amendment to the RBI Act made 4% ± 2% CPI a legal target. It was renewed in 2021 and again in 2026 for 2026–31 [4].

• The band debate: a 2–6% band lets the MPC respond to growth needs and supply shocks such as food prices [5]. But a wide band or frequent breaches can weaken people's trust that money will hold its value, and that trust is what the store-of-value and deferred-payment functions rest on.

• Same functions, new form: the e₹.

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

• Open questions: privacy, the risk that people move deposits out of banks into e₹, and the fact that money stays legal tender only because the state backs it.

• Inflation, liquidity and the savings choice.

• When inflation is high, households shift savings from bank deposits into gold and land.
• These assets are less liquid and less productive.
• So banks have less to lend for investment. Stable prices help bring savings into the formal financial system.

Related concepts

• Functions of money
• Medium of exchange
• Unit of account
• Purchasing power of money
• Store of value
• Standard of deferred payment
• Money's worth

Read more

• What money is and what it does