BharatNotes What is Mahalanobis Model?
The Mahalanobis Model is the economic-planning framework designed by Prasanta Chandra Mahalanobis — the statistician who founded the Indian Statistical Institute (1931) — to guide India's industrialisation strategy after independence. Its central proposition is that allocating a major share of investment to basic and heavy (capital-goods) industries maximises the long-run rate of growth, because a larger domestic capital-goods base enables higher future investment and output. It became the intellectual foundation of the Second Five Year Plan (1956–61).
It is often called the Feldman–Mahalanobis model, since the Soviet economist Grigory Feldman had derived a similar capital-goods-led growth argument in 1928, apparently without Mahalanobis's knowledge.
Key Features
Mahalanobis first proposed a two-sector model in the early 1950s, dividing the economy into a capital-goods sector and a consumer-goods sector, and arguing that investment should be biased toward the former. In 1955 he extended this into a four-sector model, disaggregating consumption into household/small-industry goods, factory consumer goods and services, to calibrate investment allocation and its growth and employment implications.
| Element | Detail |
|---|---|
| Architect | P.C. Mahalanobis |
| Core idea | Bias investment toward capital/heavy industries |
| Versions | Two-sector (early 1950s); four-sector (1955) |
| Applied in | Second Five Year Plan (1956–61) |
| Key assumptions | Closed economy; full-capacity use; non-shiftable capital goods |
Significance
The model embedded a state-led, import-substituting industrialisation strategy. Public-sector steel plants at Bhilai, Durgapur and Rourkela were set up under the Second Plan, and the heavy-industry orientation continued to shape Indian planning broadly up to the Fifth Plan period in the 1970s. It cemented the public sector's "commanding heights" role and a self-reliance objective in capital-goods production.
Criticism
The model drew sustained critique:
- Wage-goods gap: Economists C.N. Vakil and P.R. Brahmananda, in Planning for an Expanding Economy, argued that employment and income depend on the supply of wage goods (food, clothing). Their alternative wage-goods model prioritised agriculture and consumer-goods industries; neglecting these, they warned, would cause inflation and shortages.
- Unrealistic assumptions: The closed-economy and self-sufficiency premises ignored foreign trade, while the framework underplayed savings from agriculture and taxation as investment sources.
- Neglect of agriculture and employment: The capital-intensive bias generated limited short-run employment in a labour-surplus economy.
These tensions surfaced in practice, with the Second Plan facing foreign-exchange and inflationary pressures.
UPSC Angle
For aspirants, the model is best learned as part of a comparison set with the Bombay Plan, Gandhian Plan, People's Plan and the Vakil–Brahmananda wage-goods model. Remember the linkages: Mahalanobis → heavy industry → Second Five Year Plan; Vakil–Brahmananda → wage goods → agriculture-first. Do not confuse the Mahalanobis (capital-goods) strategy with the wage-goods strategy — a common UPSC trap.
