Fundamentals of Business Economics and Management · Money and Banking

Demand for Money and Value of Money Explained

Updated 10 October 2026 · Fact-checked

Demand for money is the amount of money people want to hold as cash or bank deposits. Keynes explained it through three motives: transaction, precautionary and speculative. The quantity theory links money to prices through MV = PT. To solve questions, identify the theory, apply its formula and read the result.

Understand Demand for Money and Value of Money

Money earns no interest when you hold it as cash. So why do people hold it? Because it is liquid. You can spend it at once. The demand for money is the desire to hold wealth in this liquid form.

J.M. Keynes, in his liquidity preference theory, gave three motives. The transaction motive is holding money for day-to-day purchases. It depends mainly on income. The precautionary motive is holding money for emergencies such as illness or job loss. It also depends mainly on income. The speculative motive is holding cash to profit from expected changes in bond prices. It depends on the rate of interest.

At a high interest rate, bond prices are low and are expected to rise. So people buy bonds now and hold less idle cash. At a low interest rate, bond prices are high and are expected to fall. So people hold more cash and wait to buy bonds later.

The value of money is what money can buy. It is the opposite of the price level. If prices rise, each rupee buys less, so the value of money falls. If prices fall, the value of money rises. Inflation is a sustained rise in the general price level, so it means a falling value of money.

The quantity theory of money says the price level depends on the quantity of money. Irving Fisher put it as the equation of exchange: MV = PT. Here M is money supply, V is velocity of circulation, P is price level and T is volume of transactions. If V and T stay constant, P changes in direct proportion to M. Double M and P doubles.

The Cambridge approach (Marshall, Pigou) looks at money from the holder's side. People keep a fraction of their income as cash. This gives M = kPY. Fisher focuses on money spent. Cambridge focuses on money held.

Key formulas to remember

Fisher's equation of exchange: MV = PT; M = money supply, V = velocity of circulation, P = price level, T = volume of transactions. Extended form: MV + M'V' = PT, where M' is bank money (credit money).
Price level from Fisher's equation: P = MV ÷ T; Assumes V and T are constant in the short run. Then P changes in direct proportion to M.
Cambridge equation: M = kPY; k = proportion of income held as cash, P = price level, Y = real income (output). Often written as P = M ÷ kY.
Value of money: Value of money = 1 ÷ P; Value of money moves inversely to the price level.
Keynes's demand for money: L = L1(Y) + L2(r); L1 is transaction and precautionary demand, which depends on income Y. L2 is speculative demand, which depends on the interest rate r.

How to solve Demand for Money and Value of Money questions

Questions on this topic are either theory (motives and theories) or simple numerical (MV = PT). Use this method for both.

1Read the question and spot the keyword: motive, Fisher, Cambridge, Keynes, velocity, price level or value of money.
2For a motive question, match the need: daily spending is transaction, emergencies is precautionary, buying bonds when prices fall is speculative.
3For a Keynes question, note what the demand depends on: income for transaction and precautionary, interest rate for speculative.
4For a numerical question, write MV = PT and list the values given, with units.
5Check the assumptions: if V and T are constant, P moves in proportion to M.
6Solve for the unknown and compute carefully.
7Link the result to value of money: value moves opposite to price level.
8Match the answer with the options and eliminate those that go the wrong way.

Quickest way: Keyword matching and proportion check

When to use it: Use this for most MCQs, as they test definitions and direction of change rather than long calculations.

Income-linked motives are transaction and precautionary. Interest-linked motive is speculative.
If M doubles with V and T constant, P doubles and value of money halves.
Fisher means money spent (MV = PT). Cambridge means money held (M = kPY).
For numbers, use P = MV ÷ T directly and check whether the answer should go up or down before picking.

Common mistakes in Demand for Money and Value of Money

Saying the speculative motive depends on income.
All three motives sound similar, so students group them together.
Fix: Remember that only the speculative motive depends on the interest rate. The other two depend on income.
Thinking the value of money rises when prices rise.
Students confuse 'value' with 'price'.
Fix: Value of money is what a rupee buys. Higher prices mean a rupee buys less, so value falls.
Mixing up Fisher and Cambridge approaches.
Both are versions of the quantity theory and both link money to prices.
Fix: Fisher looks at money flowing in transactions (MV = PT). Cambridge looks at money held by people (M = kPY).
Claiming P is always proportional to M.
Students forget the conditions behind the simple rule.
Fix: State that proportionality holds only if V and T are constant.
Dividing wrongly while finding P.
Students rearrange MV = PT in a hurry.
Fix: Always write P = MV ÷ T first, then substitute the numbers.

Worked examples

Example 1

In an economy, money supply is ₹2,000, velocity of circulation is 5 and volume of transactions is 1,000 units. Find the price level using Fisher's equation.

Show the solution

Write the equation: MV = PT.
Rearrange: P = MV ÷ T.
Substitute: P = (2,000 × 5) ÷ 1,000.
Calculate: 10,000 ÷ 1,000 = 10.

Answer: The price level is ₹10 per unit.

Example 2

Ravi keeps ₹5,000 in his wallet for buying groceries and bus fares during the month. Under Keynes's liquidity preference theory, which motive does this show, and what does it mainly depend on?

Show the solution

Identify the purpose: regular day-to-day purchases.
Day-to-day spending matches the transaction motive.
Keynes said transaction demand depends mainly on income.
So a rise in Ravi's income would raise the money he holds for this purpose.

Answer: It is the transaction motive, and it depends mainly on income.

Exam tips

Expect direct MCQs asking which motive links to income and which to the interest rate.
Learn the full meaning of each symbol in MV = PT, as options often swap them.
For numerical questions, check the direction first: more money with constant V and T means higher prices.
For the Fisher versus Cambridge difference, remember the key phrases: money spent versus money held.
Read 'value of money' carefully. It moves opposite to the price level.

Practice questions from Money and Banking

Demand for Money and Value of Money in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Demand for Money and Value of Money: frequently asked questions

What are the three motives for demanding money?

They are the transaction motive, the precautionary motive and the speculative motive. The first two depend mainly on income. The speculative motive depends on the rate of interest.

What is the difference between Fisher and Cambridge approaches?

Fisher's equation MV = PT looks at money in circulation and its use in transactions. The Cambridge equation M = kPY looks at the share of income people choose to hold as cash. Both are forms of the quantity theory of money.

What is liquidity preference in Keynes's theory?

It is the preference for holding wealth in cash form instead of less liquid assets. Keynes said people hold money for transaction, precautionary and speculative reasons. The interest rate is the reward for giving up liquidity.

How are money supply, prices and inflation related?

According to the quantity theory, if V and T are constant, a rise in money supply raises the price level in the same proportion. A sustained rise in prices is inflation, and it reduces the value of money.