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Least developed countries

Least developed countries is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Least developed countries rather than just read about it. In short: The least developed countries (LDCs) are developing countries listed by the United Nations that exhibit the lowest indicators of socioeconomic development. The concept of LDCs originated in the late 1960s and the first group of LDCs was listed by the UN in its resolution 2768 (XXVI) on 18 November 1971.

Least developed countries — main illustration
Least developed countries — illustration

Key takeaways

  • Least developed countries belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Least developed countries to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Least developed countries from memory before moving on to harder problems.

Reference excerpt

The least developed countries (LDCs) are developing countries listed by the United Nations that exhibit the lowest indicators of socioeconomic development. The concept of LDCs originated in the late 1960s and the first group of LDCs was listed by the UN in its resolution 2768 (XXVI) on 18 November 1971. A country can be classified among the least developed countries when it meets the three following criteria:

Poverty – adjustable criterion based on the gross national income (GNI) per capita averaged over three years. As of 2024, a country must have GNI per capita less than US$1,088 to be included on the list, and over $1,306 to graduate from it ($3,918 under income-only threshold). Low levels of human assets (based on indicators of nutrition, health, education and adult literacy). A country must have human assets index (HAI) score less than 60 to be included on the list, and over 66 to graduate from it. Economic vulnerability (based on instability of agricultural production, instability of exports of goods and services, economic importance of non-traditional activities, merchandise export concentration, handicap of economic smallness, and the percentage of population displaced by natural disasters). A country must have Economic Vulnerability Index (EVI) score over 36 to be included on the list, and less than 32 to graduate from it. As of December 2024, 44 countries were still classified as LDC, while eight graduated between 1994 and 2024. The World Trade Organization (WTO) recognizes the UN list and says that "Measures taken in the framework of the WTO can help LDCs increase their exports to other WTO members and attract investment. In many developing countries, pro-market reforms have encouraged faster growth, diversification of exports, and more effective participation in the multilateral trading system."

Overview

LDC criteria are reviewed every three years by the Committee for Development Policy (CDP) of the UN Economic and Social Council (ECOSOC). Countries may be removed from the LDC classification when indicators exceed these criteria in two consecutive triennial reviews. The United Nations Office of the High Representative for the Least Developed Countries, Landlocked Developing Countries and Small Island Developing States (UN-OHRLLS) coordinates UN support and provides advocacy services for Least Developed Countries. The classification (as of December 2024) applies to 44 countries. At the UN's fourth conference on LDCs, which was held in May 2011, delegates endorsed a goal targeting the promotion of at least half the current LDC countries within the next ten years. As of 2018, ten or more countries were expected to graduate in 2024, with Bangladesh already satisfying all criteria in 2018. No country presently meets the criteria and there are three countries which previously met the criteria for LDC status, but declined to be included in the index, questioning the validity or accuracy of the CDP's data: Ghana (no longer meets criteria as of 1994), Papua New Guinea (no longer meets criteria as of 2009) and Zimbabwe (no longer meets criteria as of 2018).

Usage and abbreviations

Least developed countries can be distinguished from developing countries, "less developed countries", "lesser developed countries", or other similar terms. The term "less economically developed country" (LEDC) is also used today. However, in order to avoid confusion between "least developed country" and "less economically developed country" (which may both be abbreviated as LDC), and to avoid confusion with landlocked developing country (which can be abbreviated as LLDC), "developing country" is generally used in preference to "less-developed country". During a United Nations review in 2018, the UN defined LDCs as countries meeting three criteria, one of which was a three-year average estimate of gross national income (GNI) per capita of less than US$1,025.

UN conferences

There have been five United Nations conferences on LDCs, held every ten years. The first two were in Paris, in 1981 and 1991; the third was in Brussels in 2001. The Fourth UN Conference on Least Developed Countries (LDC-IV) was held in Istanbul, Turkey, on 9–13 May 2011. It was attended by Ban Ki-moon, the head of the UN, and close to 50 prime ministers and heads of state. The conference endorsed the goal of raising half the existing Least developed countries out of the LDC category in 2022. As with the Seoul Development Consensus drawn up in 2010, there was a strong emphasis on boosting productive capability and physical infrastructure, with several NGOs not pleased with the emphasis placed on the private sector. The Fifth UN Conference on Least Developed Countries (LDC-V) was split in two parts almost a year apart, between UN Headquarters in New York on 17 March 2022 and Doha on 5–9 March 2023.

… excerpt ends here. Continue reading the full article.

Illustrations

Least developed countries: .mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}  Least developed countries (designated by the UN as of 2025)  Former least developed countries
.mw-parser-output .legend{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .legend-color{display:inline-block;min-width:1.25em;height:1.25em;line-height:1.25;margin:1px 0;text-align:center;border:1px solid black;background-color:transparent;color:black}.mw-parser-output .legend-text{}  Least developed countries (designated by the UN as of 2025)  Former least developed countries
Least developed countries: Poverty headcount ratio at $1.90 a day
Poverty headcount ratio at $1.90 a day
Least developed countries: G33 countries: a coalition of developing countries in regard to agriculture.
G33 countries: a coalition of developing countries in regard to agriculture.
Least developed countries: Deputy Foreign Minister of Greece Spyros Kouvelis at the 4th UN Conference on Least Developed Countries
Deputy Foreign Minister of Greece Spyros Kouvelis at the 4th UN Conference on Least Developed Countries

Worked examples

Example 1 — a first encounter with Least developed countries

Start with the simplest possible case. Write down what Least developed countries claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Least developed countries before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Least developed countries ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Least developed countries

In research
Least developed countries appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Least developed countries in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Least developed countries is common in secondary-school and first-year university syllabi. It links to neighbouring topics Debt, Economic country classifications, Economic development, so understanding it makes those chapters shorter.
In everyday life
Look for Least developed countries outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Least developed countries in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Least developed countries means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Least developed countries out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Least developed countries in simple terms?

The least developed countries (LDCs) are developing countries listed by the United Nations that exhibit the lowest indicators of socioeconomic development. The concept of LDCs originated in the late 1960s and the first group of LDCs was listed by the UN in its resolution 2768 (XXVI) on 18 November…

Why does Least developed countries matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Least developed countries?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Least developed countries.

Tags

  • Debt
  • Economic country classifications
  • Economic development
  • International development
  • Least developed countries
  • Measurements and definitions of poverty
  • United Nations coalitions and unofficial groups

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