Mahalanobis and the Second Plan

Detail

1. The man: P.C. Mahalanobis (Class 11, Box 2.3)

• Prasanta Chandra Mahalanobis was born in 1893 in Calcutta.

• He studied at Presidency College, Calcutta, and then at Cambridge University.

• Institutions and honours:

• 1931: he founded the Indian Statistical Institute (ISI) in Calcutta.
• 1933: he started Sankhya, a statistics journal.

• 1945: he was made a Fellow of the Royal Society (FRS), one of the highest honours for a scientist.

• His role in statistics (beyond NCERT):

• 1949: he chaired the National Income Committee, which worked out how to measure India's national income.
• 1950: the National Sample Survey (NSS) was set up. It collects data by asking a small, randomly chosen group of households and uses their answers to describe the whole country.
  • The Government set up the NSS in 1950 on his advice. At that time he was Statistical Adviser to the Cabinet, and PM Jawaharlal Nehru strongly backed the idea [4].
  • The theme of the 19th Statistics Day (2025), his 132nd birth anniversary, was "75 Years of National Sample Survey". A commemorative coin and a stamp were released for the occasion [4].
  • The NSS's 75th-anniversary year ended with a ceremony on 18 November 2025 at Udaipur, held along with World Statistics Day [5].

• Statistics Day, 29 June: this is his birthday.

  • The Government notified it in the Gazette of India on 5 June 2007. It is a national-level "Special Day" [3].
  • It has been observed every year since 2007, each time with a theme of national importance [3].
  • Its aim is to make people, especially the young, aware of the role of statistics in planning and policy [3].
  • Trap: National Statistics Day (29 June) is different from World Statistics Day, which is a UN day. MoSPI observed World Statistics Day on 18 Nov 2025 [5].

• Why he is called the "architect of Indian planning":

• NCERT says that "planning, in the real sense of the term, began with the Second Five Year Plan". That plan was built on his ideas.

• Britannica also says he was key to shaping India's strategy for industrialisation in the Second Plan (1956–61) [6].

• Openness to debate:

• He invited leading Indian and foreign economists to advise him. Some of them later won the Nobel Prize.
• He also invited critics of the plan's socialist principles. NCERT calls this "the mark of a great scholar".

2. From the First Plan to the Second

Feature	First Plan (1951–56)	Second Plan (1956–61)
Main focus	Agriculture, irrigation, power (MoSPI also lists price stability and transport [2])	Fast industrialisation through heavy and basic industries [2]
Model	Harrod-Domar	Mahalanobis two-sector (1953) and four-sector (1955) models, built on the 1955 Plan-frame. Harrod-Domar was still used for the overall projections [2]
Target growth	2.1% [2]	4.5% [2]
Actual growth	3.6% [2]	4.3% [2]
Result	Success, helped by good harvests in the last two years [2]	"Only moderately successful" [2]

• Harrod-Domar model: growth depends on how much a country saves and how much capital it needs to produce one extra unit of output. More detail is in growth-theories-business-cycles.
• Formula: g = s / v
  • g = growth rate of output
  • s = savings rate (share of income that is saved and invested)
  • v = capital-output ratio (ICOR), the capital needed to make one extra unit of output

• Worked example:

  • If s = 12% and v = 3, then g = 12 ÷ 3 = 4% a year.
  • To reach 6% growth with the same v = 3, the country must save 6 × 3 = 18% of income.

• What the Harrod-Domar model cannot tell planners: it gives only a single total growth rate. It does not say where investment should go. Mahalanobis's sector models answered that question [2].

• Background to the Second Plan:
• It was drawn up when the economy was stable, so planners felt agriculture could be given lower priority [2].
• The Industrial Policy Resolution, 1956 made the "socialistic pattern of society" the goal of economic policy [2].
• The plan also relied on large imports paid for with foreign loans [2]. This later caused a crisis (see section 4).
• People often call it the "Mahalanobis Plan" [2].

3. The Mahalanobis model

Mahalanobis model: P.C. Mahalanobis's growth model behind the Second Five Year Plan. It gave priority to public investment in heavy and capital-goods industries to achieve rapid long-run growth.

• Two-sector model (1953): the economy has only two parts.
• Capital goods (K-sector): machines, steel and tools, which are used to make other goods.
• Consumer goods (C-sector): food, cloth and other things people use directly.

• The key choice is λk, the share of total investment that goes to the capital-goods sector.

• Four-sector model (1955): this split the consumer side into three parts:

• factory-made consumer goods
• household and small-scale industry (including farming)
• services (such as health and education)

• The planners used it to estimate the jobs and income each sector would create.

• Core logic:

• A bigger share of investment goes to capital goods, the "machines that make machines", such as steel.
• Then more machines are made each year, so the economy's future capacity grows faster.

• So long-run growth is maximised, even though consumption grows slowly at first.

• Worked example (numbers are only for illustration):

• Each year, a country invests ₹100 crore.
• Path A: 20% goes to capital goods. Machine capacity grows slowly, so next year's investment can grow only a little.
• Path B: 50% goes to capital goods. More machines are made, so next year the country can invest more, and the year after even more.
• In the short run, Path A gives more consumer goods. After some years, Path B's output overtakes Path A and then keeps growing faster.

• The cost: people consume less in the early years. This is the trade-off in the Mahalanobis model.

• Closed-economy assumption: the model assumed that India would trade very little with other countries.

• Export pessimism: planners believed India could not earn enough from exports to pay for imported machines.

• So India had to make its own capital goods. This is import substitution: making goods at home in place of buying them from abroad.

• Division of labour between sectors:

• Heavy industry went to the public sector, which held the "commanding heights" (the most important parts of the economy).
  • Examples: the steel plants at Bhilai, Durgapur and Rourkela.
• Consumer goods and jobs were left to household and small-scale industry.
  • These industries use many workers and few machines, so they create more jobs for each rupee invested.

4. Critiques

• Neglect of agriculture and wage goods:
• Wage goods are the goods that workers buy with their wages, mainly food and cloth.
• The Vakil-Brahmananda wage-goods model (1956) argued that wage goods should come first.
  • When more workers are hired, they buy more food.
  • If food supply does not rise, food prices go up.
  • Rising prices then hold back further growth.

• The Second Plan itself gave agriculture lower priority [2]. The Third Plan (1961–66) changed this and gave agriculture top priority, because agricultural output had become the "limiting factor" [2].

• B.R. Shenoy's dissent:

• He was the main dissenter in the panel of economists advising the Second Plan.
• He warned against deficit financing, which means the government paying for spending by borrowing or printing money. This pushes prices up.
• He also warned against heavy state control.

• His warning was borne out: prices rose by about 30% during the Second Plan, while prices had fallen in the First Plan [2].

• Capital-intensive projects created few jobs:

• A capital-intensive project uses many machines and few workers.

• So a steel plant employs fewer people per crore invested than a handloom unit does.

• Foreign-exchange crunch of 1957–58:

• Imports paid for with foreign loans used up India's foreign-exchange reserves.
• The "acute shortage of forex" forced planners to cut development targets [2].

• This was followed by the food crises of the 1960s.

• NCERT's balance:

• "Many economists today reject" his approach.

• Yet he "will always be remembered for playing a vital role in putting India on the road to economic progress".

• What lasted: for the first eight Plans, planning stayed centred on a growing public sector and heavy investment in basic industries. Only from the Ninth Plan (1997) did the public sector become less central, and planning moved towards an indicative style (setting broad goals rather than giving orders) [2].

Prelims Hooks

• Mahalanobis founded the ISI (1931), started the journal Sankhya (1933), became FRS (1945) and chaired the National Income Committee (1949).
• The NSS was set up in 1950 on his advice, when he was Statistical Adviser to the Cabinet. The 19th Statistics Day (2025) had the theme "75 Years of NSS" [4].
• Statistics Day = 29 June, his birthday. It was notified in the Gazette on 5 June 2007 [3]. Do not confuse it with World Statistics Day.
• First Plan used the Harrod-Domar model (g = s/v). Target was 2.1% and actual growth was 3.6% [2].
• Second Plan (1956–61) used the 1955 Plan-frame and the two-sector (1953) and four-sector (1955) models. Target was 4.5% and actual growth was 4.3% [2].
• Trap: the Second Plan did not drop Harrod-Domar. It still used Harrod-Domar for the overall growth projection and Mahalanobis for sector allocation [2].
• The Industrial Policy Resolution, 1956, made the "socialistic pattern of society" its goal [2].
• Public-sector steel plants of this era: Bhilai, Durgapur, Rourkela.
• The wage-goods model (1956) was put forward by Vakil and Brahmananda, not by Mahalanobis. The chief dissent on deficit financing came from B.R. Shenoy.
• Third Plan moved agriculture back to top priority [2].

Mains Points

• Growth now or growth later (GS-III, growth and inclusion):
• The capital-goods-first strategy gave up consumption in the early years to build long-run capacity.
• It built India's industrial base, including steel, machinery and PSUs.
• But it created few jobs and neglected wage goods. Price rise of about 30% and forex shortages followed [2].

• These costs support the Vakil-Brahmananda and Shenoy critiques.

• Import substitution vs export-led growth:

• Export pessimism led to a closed-economy model.
• The 1957–58 forex crisis showed that even import substitution needs imports, such as machines, and therefore needs foreign exchange.

• This lesson later shaped the 1991 reforms and today's push for exports, for example under PLI schemes.

• Agriculture as the binding constraint:

• The shift from the Second Plan to the Third, which put agriculture back at top priority [2], shows why industry and agriculture must grow together.

• This is useful for answers on agriculture–industry linkages and food security.

• Institutions and evidence-based policy (GS-II/III):

• Mahalanobis built India's statistical system: ISI, NSS and the national income estimates.
• Seventy-five years later, the NSS is still the base of MoSPI data [4].
• This supports arguments for strong, independent data institutions in policymaking.