Inequality-adjusted Human Development Index

Geography glossary

Also called: IHDI · Topic: Human Development: Concept, Approaches and Measurement · NCERT: Beyond NCERT

Meaning

The Inequality-adjusted Human Development Index (IHDI) is the HDI after each of its three dimensions (health, education and income) is cut down by how unequally it is shared among people. The UNDP introduced it in 2010.

It matters because the HDI shows only the average a country has reached. The IHDI shows how much of that progress actually reaches people. The gap between the two, called the loss to inequality, measures how much human development a country loses because its gains are unevenly shared.

Explanation

Why the IHDI was needed

  • The HDI's main weakness (NCERT)
  • The HDI measures average attainment, meaning what a country has achieved on average.
  • It says nothing about distribution, meaning how that achievement is shared among people.

  • So NCERT says the HDI is not the most reliable measure of human development.

  • Same score, different lives

  • Two countries can have the same HDI.
  • In one, the gains may be spread evenly. In the other, a small rich group may hold most of them.
  • The HDI cannot tell these two countries apart. The IHDI can.

How it works (cause → process → result)

  • Start: take the three HDI dimensions:
  • a long and healthy life (health)
  • knowledge (education)

  • a decent standard of living (income)

  • Process: for each dimension, measure how unequally it is shared among people. Then lower that dimension's score by the amount of inequality.

  • Result: combine the lowered scores. The answer is the IHDI.
  • If everyone has equal health, education and income, IHDI = HDI.
  • The more unequal the society, the further the IHDI falls below the HDI.
  • So the IHDI can never be higher than the HDI.

Reading the result: loss to inequality

  • Loss to inequality = the percentage gap between HDI and IHDI.
  • Small loss: gains are shared fairly evenly.
  • Large loss: a big part of the country's progress does not reach ordinary people.
  • One way to think about it:
  • The HDI is the human development a country could have if everyone shared equally.
  • The IHDI is the human development its people actually get.

Where it fits among the UNDP indices

  • The IHDI is one of several companion indices built because the HDI alone is not enough:
  • IHDI (2010): HDI adjusted for inequality among all people.
  • GDI and GII: look only at inequality between women and men.
  • MPI (2010): counts poor people who face several deprivations at once.
  • PHDI (2020): HDI adjusted for pressure on the planet.

Where it occurs

  • India (HDR 2025)
  • Inequality cuts India's HDI by 30.7%, which is one of the highest losses in its region [1].
  • Inequality in health and education has improved. But income and gender gaps are still large [1].
  • The NCERT-era estimate was a loss of about one-third.

  • India's HDI is 0.685 (2023) and it ranks 130 of 193 countries. This puts it in the medium human development group, just below the 0.700 line for "high" [1].

  • Regional gaps inside India

  • One national number hides the gap between Kerala and Bihar, between cities and villages, and between social groups.

  • The National MPI shows the same pattern. Bihar, Jharkhand and Uttar Pradesh have the highest shares of poor people, and Kerala has the lowest.

  • World

  • The UNDP publishes the IHDI every year in its Human Development Report (HDR), alongside the HDI, starting from the HDR 2010.

Don't confuse with

  • HDI (1990): measures the average reached in health, education and income. The IHDI measures the same three dimensions after cutting them down for inequality. The IHDI is always equal to or lower than the HDI.
  • GDI (female HDI ÷ male HDI): looks only at the gap between women and men, and 1 = parity. The IHDI looks at inequality among all people, and the result is read as a % loss.
  • GII (2010): measures the gender gap in reproductive health, empowerment and the labour market. 0 = equality, and it has no income indicator. The IHDI is not about gender and uses the HDI's own dimensions, including income.
  • MPI (2010): counts poor people who face several deprivations at the same time (poor if deprived in ≥ one-third of weighted indicators). The IHDI does not count the poor. It adjusts the national HDI score for unequal sharing.

Prelims Hooks

  • The IHDI was introduced by the UNDP in 2010. In the same year the MPI and the GII were introduced.
  • IHDI = HDI only when there is perfect equality. In every other case IHDI < HDI. "IHDI can be higher than HDI" is a false statement.
  • Loss to inequality = the % gap between HDI and IHDI.
  • India, HDR 2025: loss to inequality 30.7%, one of the highest in its region. HDI 0.685, rank 130/193 [1].
  • The IHDI fixes the HDI's NCERT-listed limit: the HDI shows average attainment, not distribution.
  • Trap: the IHDI covers inequality among all people in all three dimensions. Gender-only inequality is covered by the GDI and the GII.

Mains Points

  • Averages hide distribution (GS-I)
  • India loses 30.7% of its HDI to inequality, mainly through large income and gender gaps [1].
  • The regional gap between Bihar, Jharkhand and UP at one end and Kerala at the other shows that state- and district-level data, not just the national average, should guide planning.

  • Policy responses: aspirational districts and state-level MPI targeting.

  • Growth must also be shared

  • India's HDI rose from 0.676 (2022) to 0.685 (2023), but the high IHDI loss shows that many people miss out on this progress [1].

  • Better health and education equality show that public services can narrow gaps. The remaining challenge is income inequality and women's low paid work (female labour-force participation of 35.1% against 76.4% for men) [1].

  • A better yardstick for development

  • Together, the IHDI, GDI, GII, MPI and PHDI move the focus from "how much" a country has achieved to "who gets it" and "at what cost".
  • This matches the Haq–Sen idea that development means enlarging the choices of all people.

Related concepts

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Sources

  1. 1India's human development continues to make progress, ranks 130 out of 193 countries (UNDP/UN India, HDR 2025)india.un.org · tier 2