What is the multiplier effect?

The process by which an initial change in spending produces a larger total change in income, as each round of spending becomes income that is partly spent again.

What determines the size of the multiplier?

Chiefly the marginal propensity to consume. Leakages into savings, taxation and imports reduce it, so the same spending has different effects in different economies.

Multiplier

noun (countable)

/ˈmʌltɪplaɪər/

In Keynesian macroeconomics, the ratio by which an initial change in autonomous expenditure (especially government spending or investment) generates a larger final change in national income. The fiscal multiplier — central to debates on stimulus vs. austerity — is generally estimated at 0.8–1.5 for developing economies; India's Economic Survey 2020-21 estimated the government capex multiplier at approximately 4.25, making capital expenditure a preferred fiscal lever over revenue spending.

✍️ Usage in a UPSC answer

The Economic Survey 2020-21's finding of a government capital-expenditure multiplier of 4.25 provided the analytical basis for India's subsequent shift toward front-loading public capex as the primary counter-cyclical instrument.

Synonyms

acceleratoramplifiercascade effectripple effectsnowball effect

Antonyms

dampenerdragleakagecrowding-out effect

🌱 Word Family

multiply (verb), multiplication (noun), multiplicative (adjective), multiplier effect (noun phrase)

🔡 Root

Latin multiplicare = to multiply; multi- = many + plicare = to fold

📜 Etymology

The term entered economics through Richard Kahn's 1931 article on the employment multiplier, later formalised by John Maynard Keynes in 'The General Theory' (1936) as the investment multiplier. It derives from the simple Latin multiplicare, meaning to increase manifold. In post-independence India, multiplier analysis underpinned Nehru-Mahalanobis planning, which prioritised capital goods industries whose high multipliers would drive broad-based growth.

🧠 Memory Hook

Imagine dropping a stone in a still pond: the initial splash (government spending) creates ripples that spread far wider. Each ripple is income re-spent — the multiplier counts how wide those rings travel before they die out.

🎯 How This Word Works in UPSC Writing

The factor by which an initial change in spending alters total income, as the initial expenditure becomes income for others who in turn spend part of it. In GS3 it is the analytical core of fiscal stimulus arguments, and the determinant to name is leakage: the multiplier is larger where the marginal propensity to consume is high and smaller where income leaks into savings, taxes or imports. That is why the same expenditure yields different results in different economies.

⚖️ Don’t Confuse It With

The multiplier is the total income change relative to an initial spending change. The marginal propensity to consume is the fraction of additional income spent, which drives its size. The accelerator links investment to the rate of change of output, a distinct mechanism. Leakage into savings, taxes and imports reduces the multiplier.

🇮🇳 Hindi Meaning

गुणक (gunak); गुणक प्रभाव is the multiplier effect.

❓ Common Questions

What is the multiplier effect?: The process by which an initial change in spending produces a larger total change in income, as each round of spending becomes income that is partly spent again.
What determines the size of the multiplier?: Chiefly the marginal propensity to consume. Leakages into savings, taxation and imports reduce it, so the same spending has different effects in different economies.

📝 Seen in UPSC Question Papers

Prelims 2021 — Banking

Real UPSC previous-year questions whose text uses “Multiplier” — proof this word earns its place on your list.

💰 Indian Economy 📖 Seen in: Indian Economy — Growth, Planning & De...

Relevant across:GS3 · Economy, Environment, S&T & Security

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