Rise in the price of a commodity means

1. Functions of Money and the Barter System (basic)

Imagine a world where you have a surplus of wheat but need a pair of shoes. In a Barter System, you must find a shoemaker who specifically wants wheat at that exact moment. This hurdle is known as the Double Coincidence of Wants. As economies grow beyond small, isolated groups, the search costs and time required to find such a match make barter highly inefficient Macroeconomics (NCERT class XII 2025 ed.), Money and Banking, p.36.

To overcome these hurdles, societies adopted Money—anything that is commonly accepted as a Medium of Exchange. Money acts as an intermediary, allowing you to sell your wheat for currency and then use that currency to buy shoes from anyone. Beyond just facilitating trade, money serves two other vital roles. It is a Unit of Account, providing a common yardstick to measure and compare the value of different goods (like saying a book is worth ₹300). It also acts as a Store of Value, allowing you to save your wealth for future use without the fear of it rotting like physical commodities Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.39.

Feature	Barter System	Monetary System
Exchange	Direct exchange of goods for goods.	Indirect exchange using money as a medium.
Requirement	Double coincidence of wants.	Commonly accepted currency.
Valuation	Difficult to determine relative prices.	Standardized unit of account.

Understanding these functions is our first step toward understanding Inflation. When the prices of goods rise, the purchasing power of money falls. In essence, the money in your pocket becomes a weaker "store of value" because it can buy fewer goods than it could yesterday Indian Economy, Vivek Singh (7th ed. 2023-24), Fundamentals of Macro Economy, p.30.

Sources: Macroeconomics (NCERT class XII 2025 ed.), Money and Banking, p.36; Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.39; Indian Economy, Vivek Singh (7th ed. 2023-24), Fundamentals of Macro Economy, p.30

2. The Concept of Purchasing Power (basic)

At its simplest level, Purchasing Power is the value of a currency expressed in terms of the quantity of goods or services that one unit of money can buy. Think of it as the "strength" or "appetite" of your wallet. If you could buy five apples with ₹100 last year, but can only buy four apples with the same ₹100 today, the purchasing power of your money has declined. This concept is central to understanding inflation because a rise in the general price level is essentially the same thing as a fall in the purchasing power of money Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.112.

To understand this deeply, we must look at the inverse relationship between prices and the value of money. When the price of a commodity rises, two things happen simultaneously:

• The commodity becomes more valuable relative to the currency.
• The currency becomes less valuable relative to the commodity.

Because money acts as a store of value—meaning we hold it today to spend it tomorrow—it must maintain a stable purchasing power to be effective. If prices rise steeply, this function is compromised because the "real value" of your savings erodes even if the number of notes in your bank account remains the same Macroeconomics (NCERT class XII 2025 ed.), Money and Banking, p.37.

On a global scale, we use the concept of Purchasing Power Parity (PPP) to compare different economies. PPP is the exchange rate at which the currency of one country would need to be converted into that of another to purchase the same "basket of goods" in both places Indian Economy, Vivek Singh (7th ed. 2023-24), Fundamentals of Macro Economy, p.25. For example, if a specific burger costs $1 in the US and ₹40 in India, the PPP exchange rate for that burger is $1 = ₹40. This allows economists to compare the standard of living across countries more accurately than market exchange rates alone.

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.112; Macroeconomics (NCERT class XII 2025 ed.), Money and Banking, p.37; Indian Economy, Vivek Singh (7th ed. 2023-24), Fundamentals of Macro Economy, p.25

3. Measuring Price Changes: CPI and WPI (intermediate)

When we talk about inflation, we are observing a dual phenomenon: as the price of a commodity rises, its value increases relative to money, but simultaneously, the purchasing power of our currency falls. A single unit of money simply buys less than it did before Macroeconomics (NCERT class XII 2025 ed.), Chapter 3, p. 37. To track this change systematically, economists use Price Indices, which act like a thermometer for the economy. The two most critical thermometers in India are the Wholesale Price Index (WPI) and the Consumer Price Index (CPI).

Wholesale Price Index (WPI) tracks the change in the price of goods at the early stages of the supply chain—specifically, goods traded in bulk by wholesalers. In India, it is compiled by the Office of the Economic Adviser (DPIIT) under the Ministry of Commerce & Industry Indian Economy, Nitin Singhania (2nd ed.), Chapter 4, p. 64. A crucial characteristic of WPI is that it only includes goods; services like healthcare or education are completely absent from this basket. Because it focuses on raw materials and semi-finished goods, it reflects the inflationary pressure at the producer level Macroeconomics (NCERT class XII 2025 ed.), Chapter 2, p. 30.

On the other hand, the Consumer Price Index (CPI) measures the change in retail prices paid by you and me—the final consumers. Unlike WPI, CPI includes both goods and services, making it a truer reflection of the cost of living Indian Economy, Nitin Singhania (2nd ed.), Chapter 4, p. 66. In 2015, based on the Urjit Patel Committee's recommendations, the RBI shifted to using CPI (Combined) as its primary anchor for monetary policy and inflation targeting Indian Economy, Nitin Singhania (2nd ed.), Chapter 4, p. 67. This is because CPI captures the impact of price changes on the common man's pocket more accurately than WPI.

The differences between the two are significant for policy making, as summarized below:

Feature	Wholesale Price Index (WPI)	Consumer Price Index (CPI)
Coverage	Only Goods	Both Goods and Services
Food Weightage	Lower (approx. 24%)	Much Higher (approx. 46%)
Published by	DPIIT, Min. of Commerce & Industry	NSO (Combined) / Labour Bureau (IW)
Purpose	Producer level inflation	Cost of living; RBI Policy target

Sources: Macroeconomics (NCERT class XII 2025 ed.), Chapter 3: Money and Banking, p.37; Indian Economy, Nitin Singhania (2nd ed. 2021-22), Chapter 4: Inflation, p.64, 66-68; Macroeconomics (NCERT class XII 2025 ed.), Chapter 2: National Income Accounting, p.30

4. Causes of Price Rise: Demand-Pull and Cost-Push (intermediate)

When we talk about inflation, we are essentially looking at a tug-of-war between Aggregate Demand (what everyone in the economy wants to buy) and Aggregate Supply (what the economy can actually produce). A rise in the general price level indicates that the value of the commodity has risen relative to money, meaning your currency’s purchasing power has declined Nitin Singhania, Inflation, p.62. To understand why this happens, economists categorize the causes into two primary forces: Demand-Pull and Cost-Push.

Demand-Pull Inflation occurs when the demand for goods and services exceeds the economy’s capacity to produce them. Think of it as "too much money chasing too few goods" Vivek Singh, Money and Banking- Part I, p.112. This usually happens in an expanding economy where people feel wealthy and the government is spending freely. Factors like fiscal stimulus (government spending), tax cuts (leaving more disposable income with people), or a low-interest-rate regime (making loans cheaper) boost the purchasing power of households and firms, pulling prices upward Nitin Singhania, Inflation, p.77.

Cost-Push Inflation, also known as Supply Shock Inflation, works from the opposite direction. Here, prices are "pushed" up by the rising costs of production, even if demand remains the same. If the factors of production—land, labor (wages), capital (interest), or raw materials—become more expensive, producers pass these costs on to the consumers to maintain their profit margins Vivek Singh, Money and Banking- Part I, p.112. Common triggers include a spike in global crude oil prices (raising transport costs) or a devaluation of the currency, which makes imported raw materials more expensive Vivek Singh, Money and Banking- Part I, p.112.

Feature	Demand-Pull Inflation	Cost-Push Inflation
Primary Driver	Increased spending/money supply (Buyer side)	Increased production costs (Seller side)
Common Causes	Tax cuts, Govt spending, cheap credit	Wage hikes, oil price spikes, natural disasters
Economic State	Often seen in booming economies	Can occur even during economic stagnation

Sources: Indian Economy, Vivek Singh (7th ed. 2023-24), Money and Banking- Part I, p.112; Indian Economy, Nitin Singhania (ed 2nd 2021-22), Inflation, p.62, 77

5. Impact of Inflation on Different Economic Groups (intermediate)

When we talk about inflation, we aren't just discussing rising prices; we are discussing a redistribution of wealth. Because inflation erodes the purchasing power of money, it does not affect everyone equally. To understand this, imagine money as a yardstick that keeps shrinking. Those who owe money find it easier to pay back, while those who are owed money find that the 'repaid' amount buys less than the original 'lent' amount Indian Economy, Nitin Singhania, Chapter 4, p.70.

The most classic divide is between Debtors (Borrowers) and Creditors (Lenders). Inflation is a friend to the debtor. When a person borrows ₹10,000 today and pays it back a year later during high inflation, they are returning currency units that are 'cheaper' or less valuable than the ones they initially received. Conversely, the creditor loses because the interest they earn might not even keep pace with the rising cost of living Indian Economy, Nitin Singhania, Chapter 4, p.78. This is why bondholders specifically tend to lose during inflationary periods, as their returns are often fixed while the currency's value drops Indian Economy, Nitin Singhania, Chapter 4, p.70.

Another critical lens is the source of income. Individuals in Fixed Income Groups, such as pensioners or salaried employees without inflation-indexed pay, suffer the most. Their income remains stagnant while the basket of goods they consume becomes more expensive. In contrast, Profit Earners (business owners or entrepreneurs) may actually benefit in the short term, as they can often raise the prices of their goods faster than their costs (like wages or rent) rise, leading to higher nominal profits Indian Economy, Nitin Singhania, Chapter 4, p.70.

Group	Impact of Inflation	Reason
Debtors (Borrowers)	Gain	They repay the debt in money that has less purchasing power than when borrowed.
Creditors (Lenders)	Loss	The real value of the money they receive back is lower.
Fixed Income Group	Loss	Their purchasing power drops as prices rise but income stays same.
Equity/Profit Earners	Often Gain	Product prices rise faster than input costs, boosting profit margins.

Sources: Indian Economy, Nitin Singhania, Chapter 4: Inflation, p.70; Indian Economy, Nitin Singhania, Chapter 4: Inflation, p.78

6. Nominal vs. Real Economic Variables (exam-level)

When we look at economic data like GDP or wages, the numbers we see at face value can be deceptive. This is because of inflation—the general rise in prices over time. To understand the true health of an economy, we must distinguish between Nominal and Real variables. Nominal GDP is the value of all goods and services produced evaluated at current market prices. If prices double overnight but production remains the same, Nominal GDP will double, giving a false impression of growth Macroeconomics (NCERT class XII 2025 ed.), Chapter 2, p.29.

To fix this, economists use Real GDP, which evaluates production at a constant set of prices from a specific Base Year (currently 2011-12 in India). By keeping prices fixed, any change we see in Real GDP is guaranteed to be a change in the actual volume of production Indian Economy, Nitin Singhania (ed 2nd 2021-22), Chapter 1, p.8. This is why Real GDP is the gold standard for measuring economic growth; it strips away the 'noise' of price fluctuations to reveal the 'signal' of physical output.

The bridge between these two concepts is the GDP Deflator. It is a ratio that tells us how much of the increase in Nominal GDP is due to price rises rather than production growth. Calculated as (Nominal GDP / Real GDP) × 100, it is considered the most comprehensive measure of inflation because it accounts for all goods and services produced domestically, unlike the CPI or WPI which only track a specific 'basket' of goods Indian Economy, Nitin Singhania (ed 2nd 2021-22), Chapter 4, p.68.

Feature	Nominal Variable	Real Variable
Prices used	Current year prices	Constant/Base year prices
Inflation impact	Included (Distorts the figure)	Excluded (Adjusted/Discounted)
Best for...	Current face-value transactions	Comparing growth over time

Sources: Macroeconomics (NCERT class XII 2025 ed.), Chapter 2: National Income Accounting, p.29; Indian Economy, Nitin Singhania (ed 2nd 2021-22), Chapter 1: National Income, p.8; Indian Economy, Nitin Singhania (ed 2nd 2021-22), Chapter 4: Inflation, p.68

7. Relative Value: The Inverse Relationship (exam-level)

In economics, value is rarely absolute; it is almost always relative. When we say the price of a commodity has risen, we are actually describing a two-sided phenomenon. First, the commodity has become more valuable relative to the currency. Second, and perhaps more importantly for understanding inflation, the currency has become less valuable relative to the commodity. This is the Inverse Relationship between the price level and the value of money.

Think of it as a balance scale. On one side is a physical good (like a kilogram of wheat) and on the other is the currency (Rupees). If the price of wheat rises, you must put more units of currency on the scale to balance that same kilogram of wheat. This signifies that the purchasing power of a single unit of currency has diminished. As the general price level in an economy increases, the amount of goods and services that one unit of money can buy falls. Therefore, the "real value" of money is effectively the inverse of the price level Macroeconomics (NCERT class XII 2025 ed.), Chapter 3, p. 37.

This relationship is why the demand for money is so closely tied to the price level. If prices rise, people require a larger nominal amount of money to conduct the same volume of physical transactions Macroeconomics (NCERT class XII 2025 ed.), Chapter 3, p. 44. In a consumer's budget, if the price (p) of a good increases, the total expenditure required to maintain the same quantity (q) must also increase, assuming the consumer has the budget (M) to cover it Microeconomics (NCERT class XII 2025 ed.), Chapter 2, p. 15, 33. If their income remains stagnant while prices rise, their real income—or what that income can actually fetch in the market—has declined.

Sources: Macroeconomics (NCERT class XII 2025 ed.), Chapter 3: Money and Banking, p.37; Macroeconomics (NCERT class XII 2025 ed.), Chapter 3: Money and Banking, p.44; Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.15; Microeconomics (NCERT class XII 2025 ed.), Chapter 2: Theory of Consumer Behaviour, p.33

8. Solving the Original PYQ (exam-level)

Think of price not just as a number, but as a dynamic relationship between two entities: the goods you buy and the money you use. You have just mastered the concepts of Purchasing Power and Relative Value, and this question perfectly integrates them. In economics, every transaction is a seesaw; when the price of a commodity rises, it is not happening in a vacuum. As explained in Macroeconomics (NCERT class XII), money serves as a unit of account, meaning that a rise in price signifies that the commodity has become more 'dear' or valuable compared to the currency, while simultaneously, the unit value of money has eroded because it now commands a smaller portion of that good.

To arrive at the correct answer, (D) fall in the value of currency and rise in the value of commodity, apply the 'Real Value' test. If a liter of milk moves from ₹50 to ₹100, the milk is clearly more expensive (rise in commodity value). But look at the currency: your ₹50 note, which used to buy a whole liter, now only buys half. This is the classic inverse relationship where the purchasing power of the currency falls as the price level increases. As highlighted in Indian Economy by Vivek Singh, inflation isn't just about things getting pricier; it is fundamentally about the currency becoming weaker in terms of what it can actually acquire.

UPSC frequently uses the word 'only' in options (A, B, and C) to create binary traps. These options are 'half-truths' designed to catch students who focus on only one side of the exchange. A rise in price is never just about the currency losing power (B), nor is it just about the item gaining value (C); it is the simultaneous interaction of both forces. Option (A) is a complete reversal of economic logic, as a rise in price can never mean a rise in the value of currency. By recognizing that price is a ratio of exchange, you can see past these narrow choices and select the comprehensive economic reality.