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G20

G20 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 G20 rather than just read about it. In short: The Group of 20 (G20) is an intergovernmental forum comprising 19 sovereign countries, the European Union (EU), and the African Union (AU). It works to address major issues related to the global economy, such as international financial stability, climate change mitigation and sustainable development, through annual meetings of heads of state and heads of government.

G20 — main illustration
G20 — illustration

Key takeaways

  • G20 belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect G20 to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of G20 from memory before moving on to harder problems.

Reference excerpt

The Group of 20 (G20) is an intergovernmental forum comprising 19 sovereign countries, the European Union (EU), and the African Union (AU). It works to address major issues related to the global economy, such as international financial stability, climate change mitigation and sustainable development, through annual meetings of heads of state and heads of government. The 19 member states of the G20 account for around 85% of gross world product (GWP), 75% of international trade, 56% of the global population, and 60% of the world's land area; including the EU and AU, the G20 comprises 78.9% of global population and 83.9% of global CO2 emissions from fossil energy. The G20 was founded in 1999 in response to several world economic crises. Since 2008, it has convened at least once a year, with summits involving each member's head of government or state, finance minister, or foreign minister, and other high-ranking officials; the EU is represented by the European Commission and the European Central Bank. Other countries, international organizations, and nongovernmental organizations are invited to attend the summits, some permanently. The African Union joined as the 21st member at the 2023 summit in India and was officially represented at the 2024 summit in Brazil. In its 2009 summit, the G20 declared itself the primary venue for international economic and financial cooperation. The group's stature has risen during the subsequent decade, and it is recognised by analysts as exercising considerable global influence; it is also criticised for its limited membership, lack of enforcement powers, and for the alleged undermining of existing international institutions. Summits are often met with protests, particularly by anti-globalization groups.

History The G20 is the latest in a series of post–World War II initiatives aimed at international coordination of economic policy, which include institutions such as the "Bretton Woods twins", the International Monetary Fund and the World Bank, and what is now the World Trade Organization. The G20 was foreshadowed at the Cologne summit of the G7 in June 1999, and formally established at the G7 Finance Ministers' meeting on 26 September 1999 with an inaugural meeting on 15–16 December 1999 in Berlin. Canadian finance minister Paul Martin was chosen as the first chairman and German finance minister Hans Eichel hosted the meeting. A 2004 report by Colin I. Bradford and Johannes F. Linn of the Brookings Institution asserted the group was founded primarily at the initiative of Eichel, the concurrent chair of the G7. However, Bradford later described then-Finance Minister of Canada (and future Prime Minister of Canada) Paul Martin as "the crucial architect of the formation of the G20 at finance minister level", and as the one who later "proposed that the G20 countries move to leaders level summits". Canadian academic and journalistic sources have also identified the G20 as a project initiated by Martin and his American counterpart then-Treasury Secretary Larry Summers. All acknowledge, however, that Germany and the United States played a key role in bringing their vision into reality. Martin and Summers conceived of the G20 in response to the series of massive debt crises that had spread across emerging markets in the late 1990s, beginning with the Mexican peso crisis and followed by the 1997 Asian financial crisis, the 1998 Russian financial crisis, and eventually impacting the United States, most prominently in the form of the collapse of the prominent hedge fund Long-Term Capital Management in the autumn of 1998. It illustrated to them that in a rapidly globalizing world, the G7, G8, and the Bretton Woods system would be unable to provide financial stability, and they conceived of a new, broader permanent group of major world economies that would give a voice and new responsibilities in providing it. The G20 membership was decided by Eichel's deputy Caio Koch-Weser and Summers's deputy Timothy Geithner. According to the political economist Robert Wade:

"Geithner and Koch-Weser went down the list of countries saying, Canada in, Portugal out, South Africa in, Nigeria and Egypt out, and so on; they sent their list to the other G7 finance ministries; and the invitations to the first meeting went out."

Early topics The G20's primary focus has been governance of the global economy. Summit themes have varied from year to year. The theme of the 2006 G20 ministerial meeting was "Building and Sustaining Prosperity". The issues discussed included domestic reforms to achieve "sustained growth", global energy and resource commodity markets, reform of the World Bank and IMF, and the impact of demographic changes. In 2007, South Africa hosted the secretariat with Trevor A. Manuel, South African Minister of Finance as chairperson of the G20. In 2008, Guido Mantega, Brazil's Minister of Finance, was the G20 chairman and proposed dialogue on competition in financial markets, clean energy, economic development and fiscal elements of growth and development. On 11 October 2008 after a meeting of G8 finance ministers, US President George W. Bush stated that the next meeting of the G20 would be important in finding solutions to the burgeoning economic crisis of 2008.

Summits

… excerpt ends here. Continue reading the full article.

Illustrations

G20 illustration
G20 illustration
G20: Azali Assoumani, President of the African Union, is greeted by Narendra Modi, G20 Chairman, at the G20 summit in 2023.
Azali Assoumani, President of the African Union, is greeted by Narendra Modi, G20 Chairman, at the G20 summit in 2023.
G20: G20 members (dark blue), countries represented through the European Union and African Union (light blue) and previously invited states (pink) as of 2024.
G20 members (dark blue), countries represented through the European Union and African Union (light blue) and previously invited states (pink) as of 2024.

Worked examples

Example 1 — a first encounter with G20

Start with the simplest possible case. Write down what G20 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 G20 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 G20 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 G20

In research
G20 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 G20 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
G20 is common in secondary-school and first-year university syllabi. It links to neighbouring topics Economic country classifications, European Union and third organisations, Foreign relations of Argentina, so understanding it makes those chapters shorter.
In everyday life
Look for G20 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 G20 in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what G20 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 G20 out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is G20 in simple terms?

The Group of 20 (G20) is an intergovernmental forum comprising 19 sovereign countries, the European Union (EU), and the African Union (AU). It works to address major issues related to the global economy, such as international financial stability, climate change mitigation and sustainable developmen…

Why does G20 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 G20?

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 G20.

Tags

  • Economic country classifications
  • European Union and third organisations
  • Foreign relations of Argentina
  • Foreign relations of Saudi Arabia
  • Foreign relations of South Korea
  • Foreign relations of Turkey
  • Foreign relations of the African Union
  • G20
  • Intergovernmental organizations
  • Multilateral relations of Australia
  • Multilateral relations of Brazil
  • Multilateral relations of Canada

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